Malicious PDF — malware analysis report

Static analysis result for SHA-256 33886646c068d286…

MALICIOUS

PDF

96.9 KB Created: 2021-09-06 08:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e28176816066d145174d5942d731162b SHA-1: 5f7ae437524ef563032c496932d50b2f5777eb77 SHA-256: 33886646c068d286e005efaf4a510476334151934f345feaf2ffc6f5b2c430ec
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves leveraging these external links for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/95fc6d2f176065b96ea8b1ccbbb46781/84519393390.pdf In PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16072e0f279067---19868956720.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/viguligugemexov.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/pipoxeperuxadozexulijurag.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/jorazijikajewezek.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace9d67ea4c---mopikugapirabopek.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160873bfc474f7---furevososedaveno.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/65715055293.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f38c7223344---dusojeto.pdfIn PDF document text
    • http://calisnt.com/uploads/files/zigaxufodokejozebevun.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/vitakegu.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/duroteramarefub.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/nodovi.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/0d3b6c7bb26a48255bf4642469ef2314/majamil.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16100cae53f83e---6582467201.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/kawodowawuki.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160edcaa1f1534---54790961270.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/69931857217.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/poravetopegel.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608491bb6d066---90448802748.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/of3v41ouar2l81rb59g30atn8g/zadexediwup.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/31934820073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=infrared+thermography+electrical+and+industrial+applications+pdfPDF 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_off000112e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E3 18796 bytes
SHA-256: 27b1d51037f8628a4309d5eaf795712200b9d61fe8fa82d16801cbfe5c373809
font_01_sfnt_off0001439f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB6 11232 bytes
SHA-256: 1452ada6d7ebf04200f7278274808f840a03587b354e3b93a781a0096d2e4898

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