Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a79d6cc3dcb8939…

MALICIOUS

PDF

94.0 KB Created: 2021-08-03 09:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 892f2df64ec9f09091ef6839c6a47707 SHA-1: ff3198fa5782315a4600dfabe6242dbd749dbe66 SHA-256: 3a79d6cc3dcb893998148f5d200e0d818cb72e83448014419e46091b4b4cc6b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://dangeloremodeling.com/nbloom/fckuploads/file/wubipu.pdf In PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/jl5cmggob23rudkno14qu7r775/pebomumamapo.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210505171645.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086ac76e4ffb---jaxodidepezapagugedomo.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/9ce546ac70a23a2c5f18d73f467802bb/zesijuzasisujitikazejoxow.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160850e1519b1b---wixug.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ea39d7459---purikojexixukigupif.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d5f3faa787d7ba8489bc1df22ade1966/vapizufajikosufuv.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/mizexofis.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1fb51cf6f8bcbb854c1b72955473754b/vibufozowutedefa.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/pevemaledavuxezeganifub.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/15613329484.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607500abcfd4b---bodujafateri.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/rapanonokolugejovotalego.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/nitetokurixipuramixutamiv.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/28808664320.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/ritunupemubupe.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/44890331443.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ca73c1a3ae00a33247ba0c1b5740f34c/pasojemi.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/78565402871.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/91707741541.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/vesukatetuxutovozanato.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/zaxolutizus.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/040a382d811e6ac67bf31b36bd38da94/21570638474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=skytech+gaming+keyboard+k-1000+manualPDF 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_off0001079f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 11376 bytes
SHA-256: 6c773d4947cbe188f4a30c1f295bff6b8c824167b9fa7887dd2ff38b1123da4f
font_01_sfnt_off00012220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12220 17720 bytes
SHA-256: 69f15ea82bed632f4fcdf9a640c889153e12abe561a4d4e202e8f9f187f1d998
font_02_sfnt_off000150db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1