Malicious PDF — malware analysis report

Static analysis result for SHA-256 1581b174c95d1e8f…

MALICIOUS

PDF

106.6 KB Created: 2021-08-27 04:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a5557d2eaaae66906b29dd66f794107f SHA-1: 8a0025a6baeee870d384b353afcc32200ce57c17 SHA-256: 1581b174c95d1e8f7e90fe58dfcb0a270dc5a3992e571fc225dabc81f59447a7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The 'SE_CALLBACK_LURE' heuristic indicates a potential callback phishing or tech-support scam pattern. While no scripts were directly extracted, the presence of external links and the ML classifier's high confidence score strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://queure.ru/uplcv?utm_term=playing+classical+guitar+with+a+pick PDF link annotation
    • https://bandai-k.com/userfiles/file/76378590376.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2f667fabf8ffbf3e7f60dc55e9631e9d/mofalozixajixes.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/tcrll30frgc1j0jl8io5h1gbl4/fixomunojanu.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/jewowapevasidadus.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b892a3dd128d67d74dde2d638adc000c/gekofunen.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/6evmmlp97rpllaf91fqutq5297/pejevuzekodabewigew.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/68753719623.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-08-22/images/files/72265360163.pdfIn PDF document text
    • https://cafesca.net/ckfinder/userfiles/files/gulimifavumodemipulelasom.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/8f7955590d7369025aefd2948287d225/wogose.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/sl9vfpbk9rm43qjq2jkb705ln6/lilorekepazujukovapuzo.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/laxuwira.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/63301140562.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/187edc799b7897f1dfdaab4663ad7ed8/vitum.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/30381923145.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/bq14pc9qtqbg3168soe60kgeg2/gobebibet.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/p3kk14vadvtvoht4unfot5r5tl/gupakaxobidudu.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/86989864789.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/26913314213.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/m27nqll8krrt1q3gsh1ncmoh0o/wakinoxinake.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/h0958ulg87ej8cfsjdvnlq9jkk/93576100200.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/15535861497.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_off00013d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15591 17672 bytes
SHA-256: 80b2d9e507ac03472beffda9ac1f0b0826361db92d164b39439c8ef585152d28
font_02_sfnt_off000182fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182FB 10796 bytes
SHA-256: 358747b4e1b13ad173af61e2ae00c4c18d48e02cde958518d0cc071d7700a3ad

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