Malicious PDF — malware analysis report

Static analysis result for SHA-256 3deff15326e814b9…

MALICIOUS

PDF

78.5 KB Created: 2021-08-31 07:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ac1b4805ed7647ca30da08dc4168340 SHA-1: 86d19a2672d029ed5a9f8887a9cf2d8d62aeb26b SHA-256: 3deff15326e814b929a5693c3d4ea958d3eac9228ae86260caa193469e3c86e0
156 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://dortmundpools.com/contents/files/lugilasujujarimawil.pdf In PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/cda4e1c787b75c87a163230a5bf75c3b/kejupadim.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/zobonajivomijonax.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/1135410466.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/fbe472650811c61d1b2f6ae57fa1899e/wodegexurixotiwilu.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/run3e2m3jn3ra9simo48lbqdc7/punoxuregarijalemab.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdaf129eb1---25471216513.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160884910bcfda---88913905636.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd542f17ed---64282538012.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/xazes.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/3936a5555c976789b26d987a7fb49569/70431526892.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/f72ab7af4e040323801492c90a474d9e/leginaviwerunizuduvulab.pdfIn PDF document text
    • https://akemi.ro/hirek/file/tigiruzixisenaximegixiko.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/lagekoweletitob.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/vun4h9jpqucujhnsi5jul51lk4/rikofugojiriban.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/mososakedesekoguti.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/17618118793.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c255c37501c---peneku.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43ff1574ea---85424479973.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/900b093884427a2403fbeea0d86b807d/12938937819.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/sixipete.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/nujexosudojoxaf.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d24d6b39b---garuguwefiranunenagogawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=beauty+and+the+beast+full+movie+2019PDF 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_off0000ca51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA51 11452 bytes
SHA-256: bf7840dddcc77d608ee80f09e61e737c1da73b7caea06bcf2ce1b07272edd1b9
font_01_sfnt_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 17500 bytes
SHA-256: 56ff80d76683af00625d0368c4d1e84f446f425ef3e3cfbb0915dff17bed4f8a
font_02_sfnt_off0001129c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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