Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3d7ca333e13bcd…

MALICIOUS

PDF

84.1 KB Created: 2021-10-06 11:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c5e148fcaf6a6729a433db9c2e8ebda7 SHA-1: 9fbf3e0c53d4331adbc29e9310f3f8225995ca67 SHA-256: 4c3d7ca333e13bcdc45c638b166d087c04ee096896761039a1feeae749bd122b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external PDF files hosted on various domains, many of which appear to be compromised or disposable, suggesting a link farm used for distributing malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. Although no scripts were explicitly extracted, the nature of the links and the overall detection suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://santabruna.cl/upload/file/64574543864.pdf In PDF document text
    • http://fohow77.ru/upload/file/38346419027.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/7733537992.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16146923c8a048---15896591756.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/rafuzobexi.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/viwuxetaz.pdfIn PDF document text
    • https://beaszemin.com/files/julirugifaselikinofow.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/tixupokomig.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/99334106580.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/jekubasomofe.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/wetukanetubuzogaro.pdfIn PDF document text
    • http://czminghe.com/upload/files/10851901626.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/gofutebuxenipujazebe.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/90572757317.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/vudiwenaviredoz.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/35716742962.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/69630016542.pdfIn PDF document text
    • https://tepihtrava.rs/files/70272156451.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/dugevumexi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/764158b08eca8ab786c3e500c3c5cb02/pijilimujafefeke.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/guvoduriwine.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/ju7n7g1qk1aiotnefr2qdbvqt3/6250976833.pdfIn PDF document text
    • http://17njl.com/userfiles/files/tujawo.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/fezodotusefodozusam.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/nanumosedego.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/zumexesadopobi.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/bebowubematoposudixevibu.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/xotaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=expedite+meaning+malayalamPDF 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_off0000d96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 22376 bytes
SHA-256: 4ca7ba58ec5bcda57beae7e20187c643335ee6241e9bc1e077553656a08ea205
font_01_sfnt_off0001127b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127B 10544 bytes
SHA-256: 1868b858dc60474d831cb896157542862b4f16c2e73e2431c64e215b91e805e5
font_02_sfnt_off00012a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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