Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe7614ce7dec0a9…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 09:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a66a1d45b82f15301eabb516490e19c6 SHA-1: 116d0c524f64c6ee9538f7e927ec510a9c090ef2 SHA-256: cfe7614ce7dec0a977bbf42a4ab5a0cc07d6e3ad765da8b3d3f5ef716fbb29d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable domains. These links likely serve as a lure to download a secondary payload, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=frontline+commando+download+game PDF link annotation
    • http://celcg.pl/uploaded/file/vesawijabamefor.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7694bd27---bekun.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0d15b003064d69c689e1b59450c8dc9d/wojasopev.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/33959772315.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/84914407228.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/29975861614.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ha31s8ehvuppeka53ffi79li4a/piwejen.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/dutom.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/18986737730.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1066e28f2---magesurofuduw.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/65609528346.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c7790f7b---gerusinuvupu.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/79094045403.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/6005350065.pdfIn PDF document text
    • https://adikkedua.com/contents/files/jedek.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/80305771311.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/53993991373.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b185e0361b---2873293452.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/51137982354.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/xuzarozoda.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/86275521300.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f7dd3a055a64bfe0a425259d15200f94/nitedepevejisuzalikogiz.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/jajidi.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1123070864612f705a94efa.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_off0000df04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF04 17832 bytes
SHA-256: 5e5736fa8a445f00b033afdb6fdbebf516c81f8bb239667ca1963bd04c5ab954
font_01_sfnt_off00010da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 10608 bytes
SHA-256: bb7aa2f2a069d9c0d17504d8e1577bd71b910464dd7dccccdc4a9b659957e31f
font_02_sfnt_off000125aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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