Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6228965b112ca4…

MALICIOUS

PDF

92.3 KB Created: 2021-08-26 07:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bfa4cc97de5b5e1f499ef618ff3bb770 SHA-1: d97a18c5e81c957ef2971dde893e7cbb1bea5760 SHA-256: 7a6228965b112ca496810dc9b02ea1f203380c928721e5156638b1346f1ae129
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, aiming to trick users into clicking malicious links that likely lead to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=yugioh+arc+v+tag+force+special+english+patch+download PDF link annotation
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/93014985491.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f606b1993cca34b8f1ed5b056e1567b5/55093529069.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/mapovosegasojuroxivilej.pdfIn PDF document text
    • https://seikico.net/img-tym/files/74751458086.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/30819140540.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096430e53c7a---xigurijutowaminitaremepu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/cdr2u0tijr1jrs1ki8pflo8v4p/dedujogusobegeburojerob.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c207a244ea1---78207953377.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/63853859246.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a710409c0c3---romizozonibafi.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/sopedejebisun.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/jipezenupefalele.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3349de2710---9332857780.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/42878376377.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/77668560339.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/94174847538.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec7036c381---27408121496.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/27042842142.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/wudogudisutat.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/11040237485.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/majexiwoxuzasolusunem.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/eo0mhdqvtv216fkpjahi8rf72l/55064942155.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/52994382876.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/127b16f479fb9d5d155a7066de1dc1dc/riwakolemasifuj.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/77092654967.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/s87me3k5rs41ejrg9pdrstcli0/40267357183.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000dc7c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDC7C 21308 bytes
SHA-256: 4fa06276e9c7c595add6dafe23bd22d6b4748d920aa91f8e0c9e44d6dd170dec
font_01_sfnt_off0001018c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018C 17896 bytes
SHA-256: 65fd5f045a8e400aea8f031aac79d84874479dc968e7425677f720d335c8079f
font_02_sfnt_off000130af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AF 11132 bytes
SHA-256: 38c5be72b7c802da6b8c5cb7bcad3782967409b92e262eaf181163adbf27e9c0
font_03_sfnt_off00014a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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