Malicious PDF — malware analysis report

Static analysis result for SHA-256 87eefe1420769e7b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-04 13:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7ac64f73bbfb92049a7571335d31b167 SHA-1: c2c07c9f2cdec9b79e90c662c87bcae2960a4083 SHA-256: 87eefe1420769e7bb233a5b994878492d35ed26190b99cdcfda432fc2f1a03c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded URLs align with phishing or malware distribution tactics, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://laborke.ru/uplcv?utm_term=tutorial+teacher+web+api+pdf PDF link annotation
    • https://albawadiroad.com/userfiles/files/90260710071.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/baxofevodufuroxiz.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/jirotepegiliseroz.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210901154445.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-07-14-02-32-37-JqGalQr1.pdfIn PDF document text
    • http://dgone.kr/userfiles/file/20210817193340.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/16328736653.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094d4c04fed3---80819702368.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c4ac661b---84488454040.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/21740996087.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/32989540175.pdfIn PDF document text
    • https://moolans.com/uploads/files/judulekodipid.pdfIn PDF document text
    • http://raczcsalad.hu/files/29241199850.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/885e667a0ce2f9a5d756ebd9667ac293/45570805344.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/lizojaxubawakaj.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/wanafoguromurelaluba.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83d9ec8521---47759718169.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832f5a662df---84382909886.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/rexoli.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/54254797425.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/k5mlctvhg39f4t23j6qdspi4e5/88256149089.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cafa016c666---gijovazid.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/zegaririzosiriri.pdfIn PDF document text
    • https://congchung7.com/upload/file/kiruzapuvisexelujarasipe.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/52166415085.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/21498475653.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_off0000c437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC437 10736 bytes
SHA-256: 7effb9981498884ebb6131acf530bbb1b9195991bccfaed0857c9333eba8ed0b
font_01_sfnt_off0000dccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCB 17460 bytes
SHA-256: 892c4b7249a1609eb952ff2041b1f8e6614c67129d9750bf2dc3e04523985c4b
font_02_sfnt_off00010a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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