Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb482ffc375e4e78…

MALICIOUS

PDF

87.6 KB Created: 2021-09-04 04:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3dc795828e99aadadf24daeb402fe847 SHA-1: 582aaaf0e4fbafcd189adefca735c6883d82338f SHA-256: cb482ffc375e4e788c30de1908aec2f27a7589caabe2b1de4849b0910d4bdccd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://thesciencenetwork.org/uploads/files/26612547497.pdf In PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/7122d27371fe2fc663456db0d9cf352a/49406418205.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160804fc5dd309---7913810365.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/90210969483.pdfIn PDF document text
    • http://temple.mo/userfiles/file/80565058753.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/35594793003.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/nimidejenafupusaxu.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/zoroxepod.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/96507629db0c8fc22ca84cdced2024cf/bixadiwerox.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/zudajitaxaleliwunifawazu.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/zunixegazosebivolim.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/25415719487.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/47595273179.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4acca42b9a99b1a43a94b55dbb6337a4/sutowamafamatusetogim.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/lunisokelimo.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/nozotojagenulevelil.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/74102502870.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91c3802ef---kokogedujiwopanejise.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/18032439543.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/q1113bqps9codrh90fhi6u0pqu/58881229250.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/69448655262.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a98583364ad---penodosawinevajejomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=frequency+distribution+formula+pdfPDF 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_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 11256 bytes
SHA-256: acd81dc7fb9919d90ce3f97ee396920a5bde6e3ef1e7bf2443c4ee5b4b22cc28
font_01_sfnt_off000107f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001200b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200B 18596 bytes
SHA-256: 306d1845a3bf511a75d38d4a289f130376cff54fac630c6131131d68a2df81bd

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