Malicious PDF — malware analysis report

Static analysis result for SHA-256 12830f9f8a4bd730…

MALICIOUS

PDF

87.5 KB Created: 2021-07-02 15:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56bfa253d0486ca2d7bd82e2e8b70d9f SHA-1: d421e78d89669933af52e6fd938b069120039415 SHA-256: 12830f9f8a4bd7306239477285fcd330337cb7c49f2baaf83f1598bc03bb5c48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a 'link farm' heuristic and the ML classifier's high confidence score indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://drafthe.ru/uplcv?utm_term=journey+to+the+center+of+the+earth+pdf
    • https://safrano.pl/userfiles/file/71829960810.pdf
    • http://smolensk-bakaleya.ru/userfiles/file/navanufesozodutud.pdf
    • http://georgekoldun.com/var/upload/file/nerezavo.pdf
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/xizemilegezobiduzikut.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/e6nap7gjgbsf49mvrdsb0a3ru4/bagazolevi.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/zozuruturajanapowut.pdf
    • https://pjkconstruction.ca/images/file/tuniditevimagulabi.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/9cf6b9165ab9d58deff5e4c06c796fc8/79024996851.pdf
    • https://gulyaskantin.hu/uploads/frontend/files/35668836927.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b5289cf80---pefomudezotilujebuva.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085140313f1e---paxawusebefu.pdf
    • https://havanic.com/cache/fck_files/file/70068793246.pdf
    • http://webinaris.net/ckfinder/userfiles/publics/files/40149764054.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/liceriico24gdcaug9sqb5cko1/35010771651.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/17d76ec52f02c1ab8e4d157ad79640db/jemerexobiked.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/545f5844c2512cfc2791d44b541a2558/xigoxoga.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/cd8cfb8b1b5448a4435d797be4fdb469/zadobaboga.pdf
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/10403360302.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/b7325c4d96eb738e807ac29ef955e7a0/22511531763.pdf
    • http://izeninfo.net/admin/upload/files/sabug.pdf
    • http://amandatravel.com/userfiles/file/kukisot.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c38113955b---dotejuzarawadozega.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160882577a4510---50271843477.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070035b23ebb---sodibavorotabewu.pdf
    • http://asianmosaicnyc.com/userfiles/file/nokasez.pdf
    • http://bmsorganica.com/userfiles/file/12480037086.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607550c46f669---42035680263.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_off0000edbb.bin
fdc7a0b319be6f11fb0ee455c681a7f371ab05d527d17273a15f8c4042f3bdb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 19208 bytes
font_01_sfnt_off00011e34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E34 16792 bytes
font_02_sfnt_off0001364b.bin
0f17c7de47bb76c5a1362b6cfc6a02fd91d1f5f0297222f90f4557213725f3b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1364B 10616 bytes

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