Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e7810b485d9013…

MALICIOUS

PDF

106.5 KB Created: 2021-07-29 23:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b2926e0d52cd0dd9aa952de4b99b6de8 SHA-1: 8d8c40ab8a6f3e55605d464b031fbb979be9666f SHA-256: f3e7810b485d9013922545d80f3e52dd6cbc55c790c3f41139b7ca8314bd896b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to PDF files hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=curse+of+strahd+maps+printable PDF link annotation
    • https://dovolena-jiznicechy.cz/uploads/furutefedatemi.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01c8e95a41---19599299452.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/zelojaruwukenafovuwiw.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608230f4f163a---girelubuxojuparuxot.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/jerawak.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071653ab00a2---97941636764.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/46831877516.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/93986421521.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/gexupep.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/gadexokaxugevak.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c62f0494d8a---liguzixaxowokatatak.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/zegogapujixotoxoto.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/42316373331.pdfIn PDF document text
    • http://algeos.us/js/ckfinder/userfiles/files/wivevupupegi.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/89802722570.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53443dc5f0---dutorabukijekow.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/395da7cf366f75f12b38dd54ddc2bc69/lanulitirejujixilosuz.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b39628149a73934d5356e0bed11ddf42/rodonipedanilerosevana.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/vetikime.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607acd8d7f0d5---lebodunufokanul.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
font_00_sfnt_off00012c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C64 11032 bytes
SHA-256: a0b11939e89920405a32f6fdbd0953aca17886af5ab8ba186a7648f6d1704b05
font_01_sfnt_off000145a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A0 19864 bytes
SHA-256: 4027679bc8043ef7de3cb8a853e2856e349606ba15d84d0a84839478988b30b7
font_02_sfnt_off00017a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A61 1720 bytes
SHA-256: 33fba5f1c4ddad3bb743e01a21b037da64025b98b0cb0564920c5507c8bae08c
font_03_sfnt_off000182a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.