Malicious PDF — malware analysis report

Static analysis result for SHA-256 2444ee4eeaf48ff5…

MALICIOUS

PDF

86.8 KB Created: 2021-07-16 01:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eb3ee21da072dab52359d55f19af52b0 SHA-1: cef733f7852822127a9a48070b78a78d2160f245 SHA-256: 2444ee4eeaf48ff54e4eaaf23596c6b716baf77309745ded06d53da14669671b
176 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the heuristic for callback phishing lures further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=business+report+pdf+download PDF link annotation
    • http://www.alfapilates.pl/upload/file/36688015779.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/286aa7c6996d337d2605dee26d93c16c/79363618514.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/livafabapovonajanobigi.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e1cdaa9ed---39044188093.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/33f4f15d1b9756078bea6351b39b31aa/20578465070.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160772eefe7f7d---9414739317.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/31474816090.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/35687493236.pdfIn PDF document text
    • https://giustofiori.it/file/xokenafakuvareja.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/os7k7fuhg4ohhbpldiiv93gc6k/76237347952.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/pogijovowazog.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdab5621282---tugogisijek.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/gakim.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/62914669251.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/l4aikbig7hmoj1dkolqc54vm0t/39492257813.pdfIn PDF document text
    • http://gapp.fr/medias/files/75721709898.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/k9u9hd5qnrsgur9a0pt20pngis/83595712524.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2384ce1bc4---biduxeliralul.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c6116795---31293401138.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/10764209487.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/17015492492.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/20274935697.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/90b910cb1352fe682ab0cbef94a8eada/nafifalevajojoxeto.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ef3dcf9e105e0bd2d0f53f8f1e05990c/45274191590.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b701be2caa6c4f230036d64546bff724/91244714619.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/87915856238.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/rofegopisip.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_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 16904 bytes
SHA-256: 1ee1ffdafd90223a8d56c5aa382a3aa6112c000d832ec0b16e4ef0f3339cc7fe
font_01_sfnt_off00011cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC1 10728 bytes
SHA-256: e0e302fe3b7feb562b385d08f3178e664001bc9b3c90dba915ab957d8b65f532
font_02_sfnt_off000135a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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