Malicious PDF — malware analysis report

Static analysis result for SHA-256 0167cd6a7778dc9d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 03:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1d481e320da26e409c5e8904e77946bf SHA-1: f0555f479089f713130557101e9643fc6cfe5d18 SHA-256: 0167cd6a7778dc9db09e088a9cc38b15f83ea614ecf2fcefcac6d3809df6f6a6
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wenfengsi.com/wfs/WebFiles/file///2021091123490372.pdf In PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/tubisotexokemokutesutiw.pdfIn PDF document text
    • http://3q1p.com/upload/file/21091322125764850120pa2la3yxe9.pdfIn PDF document text
    • http://taociren.com/upload/file/210914013129742252yy2ejp6po7gg.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210907_055715.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/80c7657a9ea1abc1e045a07688c95006/91863752020.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/86900023851.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614047bd9f24d---tuxikozenezaxubix.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/pazajinido.pdfIn PDF document text
    • http://handientu.vn/userfiles/file/13238700909.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d54a0642b1---53787644087.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/pazovawomadutugepofowo.pdfIn PDF document text
    • https://activepymes.com/pub/file/80977729699.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210906_02E0DC01FC6236F7.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/lajixelisizosig.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5e38ee0620e6da0663528875bc2534fd/manisokijepigagovawutazad.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/binopimineniwegaga.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/suzimijuzejexakinutopi.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/37097663546.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/3173139808.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/28288661359.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/marefibiwirodowotadot.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/xevulivuxonofixino.pdfIn PDF document text
    • http://scsychem.com/upload/files/logekutob.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/besaxefaxovanovovixar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=comix+casino+no+deposit+bonus+australiaPDF 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_off0000e16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 11048 bytes
SHA-256: 4c95e84f55d80ce3a4ca77cda6a2443d2992f43212a171307fa667d1a789acc3
font_01_sfnt_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 18928 bytes
SHA-256: a8bb265137d295ba982e990d948e0a2e02b3b8ec109eb11db7ea941867ac88c1
font_02_sfnt_off00012c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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