Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3a3856c8aa1849…

MALICIOUS

PDF

86.4 KB Created: 2021-09-12 09:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4f09716b3c991834886677e8bb80bd17 SHA-1: 70e8ad7d44e45cd6442ec4ff5eaaab38a6ac97a7 SHA-256: 0a3a3856c8aa18494e90b0a92d8a78ead97605adecac222580fb929881cc61ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs and embedded links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://smidgel.ru/uplcv?utm_term=magisk+root+android+9+apk PDF link annotation
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/b502b5ffe73887f7196ea064d67d7f0a/86535307588.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/76166577190.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/zagukaredulidulexi.pdfIn PDF document text
    • http://sinners-party.de/media/file/biregovebimig.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/somenedizugi.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/6959622873.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/voxolobaluvoxi.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/tusegote.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/21661830150.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/rilovegu.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/21233167813.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/43437898869.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/napaw.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/87896867965.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/47730094964.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375a79e4778---48398676339.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ec6b4cde0---surebuwiruxevuki.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5a0h5j3hb4puosil1rkgl1a5e1/vevojunifo.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/wakutivogizixabum.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/dikuroguvaradonu.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/66999982687.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613109852b180---zokukib.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/nosovubanitasosiledeb.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 19408 bytes
SHA-256: 81fb164b4085067a320bfd8e6a3fe1ce44f2306050e3442736b8b8d258e7a7ea
font_01_sfnt_off00011bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CF 10640 bytes
SHA-256: d5cf3898c832998e1cc6c160073ac596d777eed3ac6c463e3c884a4cb4ab8e82

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