Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad84a7c7b1bedc69…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 07:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 46705d345e23b23ee4292c2b628d298f SHA-1: 332355044eb9f171739f8428eed2c01401b85314 SHA-256: ad84a7c7b1bedc69300690ee33961045edbad85e81053fa3a8c0a0293d5e3301
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs that point to various domains, many of which appear to be disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' firing further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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 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.
  • 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://crewmak.ru/uplcv?utm_term=before+sunrise+watch+online PDF link annotation
    • http://offerseir.com/basefile/offerseircom/files/xivimelofap.pdfIn PDF document text
    • http://scantech3d.com/files/72708923663.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/muxex.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/166f25e89a99d828dc91d6b903af995c/dafedadivafasug.pdfIn PDF document text
    • http://sivam.pl/files/file/kosidazagapepivage.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/6091771823.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/19103594578.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/wazowonixokalawowagadoke.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/46786773305.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/fubuwupubipop.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/tubusizo.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210903_A0028417CACC53C5.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b304a04e79---xiretonapiso.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/73779303311.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba47a51aeb---87096316633.pdfIn PDF document text
    • http://classtool.info/upload/files/66756622182.pdfIn PDF document text
    • http://interior-mark.com/ckfinder/userfiles/files/litet.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/kopekopi.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/kubapapuwe.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/muzaguparufofapowavam.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/dadukofewexuvi.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/rebivamowibelodisafeb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E0 10672 bytes
SHA-256: b9bdf2fd13594715fd7757d55c31015105056945ca26cff2bce5f4002e41a531
font_02_sfnt_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 14548 bytes
SHA-256: 1849c30890220b030bb0846c53238575d445d0c6cdec60758fb2d402f8a2e752