Malicious PDF — malware analysis report

Static analysis result for SHA-256 576abe28d3f9b8f8…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 05:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d0829fca3ab6e533a71c2ba96a1854a SHA-1: 61ebf7f0b6651b9c59af9308964e3ff9f3fe2f4e SHA-256: 576abe28d3f9b8f8d042db7d775c7c94a844577f46e1e7b616649adbf391698d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to compromised websites, likely intended to lure users into phishing scams or download further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://archism.ru/uplcv?utm_term=ingress+spoofing+2020+android PDF link annotation
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614227eec95de---93787553591.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2bc7c47b84134588444f1f8ffea39963/boxagenifesatujevoxibo.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/88103004607.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d17e64810c9752eec92419d37773b0b1/57008275695.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/53289102614.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/kofateropubaj.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/1975609743.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/8688407969.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/52551000532.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109021408244206.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/364c359674dcc25f19e9293478f16ae5/wekedozaz.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/83706627833.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/57574918415.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/63022674380.pdfIn PDF document text
    • https://robertbah.si/files/file/48861131874.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/43770394170.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/32342463662.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/muvojatokes.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/7f5e2831b6f9b016e018f5b472417468/nasawuraj.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/wawovirazovonelav.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/mufebozudisuzivepa.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/77605178e4b126d62eecc70b51f41cf4/1881947544.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_off0000dd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 10724 bytes
SHA-256: deed58a5aad86964f920c0602c00a5a2e44307ef5ed3a71359bfdd9c49b59c21
font_02_sfnt_off00010dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 17840 bytes
SHA-256: 0e185e3a7cb01fd718343c0b4a0bcd77742e72b57a7b6c3cee4e1a53b99cdf09