Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc2c07e1562ad28…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 02:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7accb7dc5629ba545869c2aa716a55a7 SHA-1: 7c275614da6e128c804019dfbbdb0f8e6ddddcf5 SHA-256: efc2c07e1562ad28123cc5dc3bef1525a87ee28c12503db9f73b657fb15de353
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on potentially compromised or disposable infrastructure, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing lure, potentially leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.
  • 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 http://tdsns.ru/userfiles/file/fevawezeriguzoduwe.pdf In PDF document text
    • http://netflor.pl/upload/File/rosunoparowimeg.pdfIn PDF document text
    • http://vitrine-prof.com/files/38874927886.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/42600038580.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/52683810224.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///bepovetelifosufimevisen.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea3bd0fa5---xojudexa.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/nanifixav.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/kosanedurajupababoz.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/dirijuvusekar.pdfIn PDF document text
    • https://noddy.nu/images/file/jabezelenawuvukebifi.pdfIn PDF document text
    • http://storemisr.com/uploads/files/vijebowevin.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210911093755.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/luxewoxemez.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/07ba24286ead604c8492bffd3c088ea1/zizatojadad.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/92525780369.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/98385032174.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/72477676916.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/30230655781.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/fisifixoduboje.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/62731602222.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161391a65e0b04---23749444159.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/situlakovifaz.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/26426036354.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/94390241343.pdfIn PDF document text
    • http://bdn10.cz/files/file/loxofuxopabajowir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=windows+7+sp1+product+key+64+bitPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE133 17924 bytes
SHA-256: b0eea9f0ed80a17c3accaba356b3a44329a49117018c74cc68528262a48cdda7
font_01_sfnt_off00010f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12722 11172 bytes
SHA-256: 0a0aed460784309c5e2d58458f0cae415cdc102047456a1b6a3c30a55a2e4d67