Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43a8e8a6bda66b9…

MALICIOUS

PDF

83.9 KB Created: 2021-08-17 00:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06e1576011d30405afe832a374bd4589 SHA-1: d7f56f7ba7e1064b3276d95e71d4e7cf20d839b8 SHA-256: d43a8e8a6bda66b9c9cbba8ead478b8c36ef28158d3e3281887c73ffc0fc0818
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics suggest it functions as a link farm on disposable hosting, with several URLs pointing to compromised CMS uploads and others using 'utm_term' parameters, indicative of phishing or SEO manipulation. The document body, though truncated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, aligning with the observed link farm behavior. The presence of multiple external URIs and the 'SE_INVOICE_LURE' and 'SE_CALLBACK_LURE' heuristics suggest a phishing or scam attempt to trick users into visiting malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://garglob.ru/uplcv?utm_term=how+to+cheat+on+the+tsi+math+test PDF link annotation
    • http://catgarner.com/clients/873270/File/rerupeguma.pdfIn PDF document text
    • https://atrax.hr/files/bizifeverijezafa.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/julosafexefas.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/40818263678.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/a71e77d3273dfc05f493e7f0369290ef/90360706556.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/fajigabavep.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9737a7119---53999571177.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/3915568901.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/simopafup.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089618f4a4e7---11596905510.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607940908dc54---dasuga.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbcd82744bc---38674172774.pdfIn PDF document text
    • https://mollis.rs//files/14349702586.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f1147a24b---17892817164.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8f7beeef3---nasoroluxijilutojow.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/87751222326.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/1c1ae2f9ac34d3e01f81496e60708975/ragofamerabez.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/66499363544.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/b2bdd8716f9b0dc9a0187405e45a5924/sekasatapagagonovisafejoj.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/pirutuse.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/qpsopv63d2bul31ntsvaefbgf8/24852942376.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/65e29f21d8793893152ea521e316eac0/sulawibiwilufavabatuko.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/kigukuzowanujuxamapi.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/39877508812.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_off0000e2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 17864 bytes
SHA-256: a078c766c523685ea2a0c7cc6464c172200a4fe6693eca9bd28cde093fda01ca
font_01_sfnt_off00011213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2A 10428 bytes
SHA-256: 037b2c78762abfef6223976e790a03a03e8fe55bc380b691106c367bc12a2953

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