Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c198d65d4b5fd9…

MALICIOUS

PDF

107.4 KB Created: 2021-07-27 15:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2414777159f24d6e4c59c1a2dbbbec3 SHA-1: 9e5b839751d5e049f4fe5f1004047c23b48aebf5 SHA-256: 98c198d65d4b5fd9f5d271134074dad25ba01d381eff2c28818379739dd2e478
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm for SEO manipulation or phishing. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt the user to make a phone call, consistent with callback phishing or tech-support scams. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the embedded URLs to facilitate the scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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.
  • 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 http://gayaarchi.com/userfiles/file/20210701184549.pdf In PDF document text
    • http://marinda.ru/pics/images/file/newaximulotidarifuweno.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61ec19e034---61826516261.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16072db1b81c76---vipodazujimedivol.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///71254642259.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/jidixuxid.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/2499342256.pdfIn PDF document text
    • https://aashianarealty.com/file/vasek.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2dea95f62---13216673342.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/0vmkg3sdosap6itfdmchg5c4hr/zekujonajarujojuk.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/bomotobawamadesegobabup.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe08d0ec6---bodiputujeje.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/55929590368.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/gofit.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/laxowonuxigeram.pdfIn PDF document text
    • http://blueyee.com/upload/file/222334382385.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/920b53104fdd0fc6e1ee7ed1cfb70c32/vavebereferifojovonolik.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/barowotujir.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/75092270051.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd328d18d---64138779925.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/laxekanogi.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/rozibalalewanigunuja.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/bb6383f0e447670436db1933dc7dca99/49578740525.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/pixamadezuwemew.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b7b263866---41695398728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+much+do+you+charge+for+a+finder%27s+feePDF 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_off0001405a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405A 17228 bytes
SHA-256: 0494ccfbfdfb051aeca17dfe1e8ce018d1933a867f02b05561e94377576f98d3
font_01_sfnt_off00016d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D6D 11104 bytes
SHA-256: 7599a057dc37178e7be9948f77c7a9c00bd96b3a7a5e61aca73a1c9f1fc3e8f5
font_02_sfnt_off00018703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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