Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3aa42d7e8db6fa…

MALICIOUS

PDF

92.5 KB Created: 2021-06-29 21:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 0b9972967759055aeaf9bf0025f84114 SHA-1: d49927d63d6e3a1174508cedd40937e0080ad121 SHA-256: 8f3aa42d7e8db6fa746f1bb6ecabe77923519f498cac4556782dfc88bcc12766
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites, suggesting it functions as a link farm to redirect users to potentially malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3382a8894---funegazemubisigosimapofej.pdf In PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070225c153e1---fikaxitizusuwukovib.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8b3f520ada943844b4b57f7a14e91fb8/zipuf.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/p41ruqd1lqu1m124hmv8bjan99/58935745975.pdfIn PDF document text
    • https://europartner2.pl/uploads/80040540750.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5678145d1---92486769261.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/re9seebd6ssgbqr9116toc19ec/87580283512.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/matekozafalito.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/dagavibiwojobulapetof.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/62759748412.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/79d80fbb8b6f8a0b3e438e7ca1465553/gujigenovotevotibolez.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/41173399332.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/pobutuduzorajedovepigij.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40b1145ca---silubizuda.pdfIn PDF document text
    • http://termitecontrolservicebd.com/ck/upload/files/26203509869.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/xazapiraritaxozipetu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3e10a2327---sewikoxuladozuwe.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb51f1a7ebf---68582750603.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/diguripajezonem.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/vepazofozerunit.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84edc7045b---vitowufebabixibivel.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cbc234680---tutojolisedugixana.pdfIn PDF document text
    • https://2acontractor.it/images/file/janakog.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/jagirevepularivumuvekuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+dominate+a+sissyPDF 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_off000108f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F6 16992 bytes
SHA-256: d7b6b4b36e2bb39290d17e753bb759989495f28be63bcfa20b27cafc19fc1bd9
font_01_sfnt_off000134ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CA 10456 bytes
SHA-256: 69cf677daff91a84c27f256992eaaa78002846de552e3b4e049c1666006ca635
font_02_sfnt_off00014c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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