Malicious PDF — malware analysis report

Static analysis result for SHA-256 2607d0346aeacbe3…

MALICIOUS

PDF

84.5 KB Created: 2021-06-28 09:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 457eda50c71971933b2a3cee1168d2cc SHA-1: 82d660affb335acde74dce4d1ab53cc447717343 SHA-256: 2607d0346aeacbe3c074fa2a8150ba6edc4d8875fd5137763659e94724cd526e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content or exploits. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bishopsalamatkhokhar.org/userfiles/file/32798647397.pdf
    • https://palezieux.com/ckfinder/userfiles/files/61547997354.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/33fb8fa1c294a404c76d466e9a7ee123/49994982952.pdf
    • https://open-call.fr/uploaded/files/sudulidiw.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608218ada8c1f---7239731565.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607280c20e7a9---tuvogokupasufonojik.pdf
    • https://navliecky.net/userfiles/file/telopamugogesijiful.pdf
    • http://www.irrv.org/uploads/files/46266333709.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce4d1ede8e---8345372443.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f92a1534c---89640777703.pdf
    • https://xehowo24h.com/images/ckeditor/files/liwijej.pdf
    • http://compufoxmail.com/userfiles/file/92468621954.pdf
    • https://activepymes.com/pub/file/39587488328.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e16d4b5e23---jijisanisepep.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/cmf1it84mb4udftqmii0do9cl7/10955231239.pdf
    • https://lifecareproduct.in/ckfinder/userfiles/files/98808671227.pdf
    • https://evergreencans.com/userfiles/file/nitira.pdf
    • http://studiotecniconuti.it/userfiles/files/lekir.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fa840ae62a17e58c0df71c8137161792/94714978612.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5c937629c---47584548735.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/1e02f6ddcff7f814da9fe21e70adbfef/bodunafapo.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/cd9abd61c22beb03ff2730910f840cff/47478507381.pdf
    • http://goteneplast.se/files/images/file/limenexajusoxisatok.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mother%27s+maiden+name
    • 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_off0000e88a.bin
2715d47a408f7a335cfd6a58b44d88c9b40642109de91c536f4fa9dd4c9d5012
pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 10492 bytes
font_01_sfnt_off00010047.bin
50cf1f56bbfbc73883878a98dfbb2ab85548ba22916b63fd7a073e5773ccc5b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10047 16752 bytes
font_02_sfnt_off00012bac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAC 16792 bytes