Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c415ef78057273…

MALICIOUS

PDF

91.5 KB Created: 2021-07-27 18:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c575f6233fb835799446e27ac22cc303 SHA-1: da56c033f6d1700de0e8ad9c107d35c0c3874de4 SHA-256: 43c415ef78057273665304d5d25c61b45198b54a573da9895e2d86ac1db87d7d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to manipulate search engine rankings or direct users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery mechanism. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/4g28l2m19suphtdbfn9tc2fmvj/53190838413.pdf In PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a9f9e54786e30d0e1c5653eac6435018/xuximopebosuxibikadupu.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210723_93A73364B11C103D.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/5439824615.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/vetujabezebutebule.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/boxofoniviranogit.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b81e963ee9c---23042287583.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/c88qis8tmjhmiakerulv2fdu97/60065203904.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021060404175199.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/f5qe8rkg1seig8utfn7fhiur57/25830410247.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/rezelabat.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608544b59839b---lozukupakagiju.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/66438959897.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/44986848665.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/47858872409.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/dadanuderasupotofujidugi.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/gavaretomomaz.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/kepuxutominu.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/pebubumek.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9154828f9---roxijugitapenoxumepuso.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/mn9b08jichvakda3l2ocoalom6/navilezuxalexoj.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/nepuwokuniwi.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021050906373973499.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/68344855804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+regular+polygon+has+an+interior+angle+of+144PDF 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_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA4 20712 bytes
SHA-256: e5f6b1c37b94098ced561a30ef3041c30ddd2eb2dc7f496994f10ff18b26c7f1
font_02_sfnt_off00014673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14673 10976 bytes
SHA-256: 3f4c80e80100d4e546e6a242875dcfb29e2f542622f0ed0f428c0fdaffc798ec