Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8baa885ea889bd…

MALICIOUS

PDF

95.6 KB Created: 2021-06-29 09:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 896ca59da8bac4358e3f0c505cdd8189 SHA-1: 5b5c2ec20c05328dd30d5a7c52ad8cfbde379fc5 SHA-256: fd8baa885ea889bddc80a4c7843f62d6006ffd579640d40fb5e06130c0f91437
164 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ad74267b1---fefamisawu.pdf In PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/7a599e2384de78e5990340d91bf6d3ec/fubizebolebiseza.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/o8r8cp2o2m0er0uhbamn3ge6at/44087620730.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d574fe7096f---zanikadiruwevasugi.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160870f94c4e8e---80918617644.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/6666214407.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf726a75f---nodavegigikawav.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/lotaxokes.pdfIn PDF document text
    • http://azizolace.cz/images/file/vivevezixixibeleleli.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/zonatuxixaridisubiranumoz.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fabd23dbdb---41620241419.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19b2782936---mosafavinifulikelib.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e28ea06dfd431cfb92d65e561ab3caa0/51432979392.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/fapimaxutijowit.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/momikuredajatigopogivogag.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609985b92ff28---85776286206.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/9698b74a8783eeb569b5877fd56758c6/57468740936.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/99827680056.pdfIn PDF document text
    • https://avenue102.com/uploads/file/98770709826.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/6521649690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=cut+my+finger+while+cutting+vegetablesPDF 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_off000110cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CF 17636 bytes
SHA-256: 5e9217dbfad8b11450fe81ee0063669e47687bdf2eac31f077fc23438b5f8a46
font_01_sfnt_off00013ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC6 11200 bytes
SHA-256: 0f594511ee3c0827d39b54be2da06cd36e42a7849c3fa150ad947bed8d387cba
font_02_sfnt_off000158ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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