Malicious PDF — malware analysis report

Static analysis result for SHA-256 207392c992c87519…

MALICIOUS

PDF

86.8 KB Created: 2021-07-03 15:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bbee736c87723943a96a014993daceb SHA-1: 3d8b91b4e40207a589239dafba95e9059359ce81 SHA-256: 207392c992c8751907eefc9acdb33ac0c79341ce6f451bdcea476123cb69aa41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://chcial.ru/uplcv?utm_term=justin+and+adrienne
    • http://gift-founder.com/archive/upload/files/dijekipiginemixafok.pdf
    • https://ienter.bg/files/17805522844.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/puxawat.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/ac5823feb12a20c5c301c71131398004/96589412858.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/d158da4c79e788a9ef04d52c6d9f8bb5/bifivevesefivinufubevowo.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/616888826fd376febf98db8bbde14c05/51569329151.pdf
    • http://falerisztika.hu/tmp/12484576433.pdf
    • http://wccflooring.com/userfiles/files/wuwis.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed87ed630e---kolivelowifazovitozu.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609252f8879d5---bopafibasefamupixomud.pdf
    • http://gsmontaggi.it/userfiles/files/62275055950.pdf
    • http://cuatro-pr.org/sites/default/files/file/gevogaboz.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160724a1f7c6f4---gokametamiporemakilexofes.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/afb9944fc5c211c8684f6b7c13eb2fa0/bivuzokupevudugodow.pdf
    • http://kartinatv.org/uploads/files/71763507904.pdf
    • https://parklanehotel.asia/userfiles/file/76524005125.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec0dc7bb22---10215272815.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0a073c743---13986123130.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/3e84175ae32e0df5ef6b32189dea66ab/85282261244.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/bsm98j4lms5c7ljkkcgqfdn3eb/wotimavifetudogefiruf.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/4396a3b3c160aaeca22d39a6a717e646/bitolusiziwetirigaxoxek.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/233c011cb1a7e23823acfd437fb1c597/zikopabome.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/29a95aff4c1b90da50024560ec7729df/83275950586.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e8dfb2caf---musesu.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vn3uvp50b7jceg7dtg4t7tjqk0/vutefesixa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f23d.bin
5c91bce476149c65003f05c63e86a4879b030f353f9fc9eabc0016ee3bb07fdf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 10168 bytes
font_01_sfnt_off0001091b.bin
fec5c309d4c183840f9d8700208c6faebb9c43ce90eadf643585dbe6d67548c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 17232 bytes
font_02_sfnt_off00013636.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13636 16792 bytes