Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a425ed37c2a6d7…

MALICIOUS

PDF

87.5 KB Created: 2021-07-04 05:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdc182a77cf8930eb8d24c11104f2009 SHA-1: 8372df373c1cfa73e9dedee1860be7f4b50e55a4 SHA-256: 91a425ed37c2a6d7a7209fc7ba79ab42d6741754c74af530ccad5f288a72dace
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, functioning as a link farm. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pistant.ru/uplcv?utm_term=6+weeks+pregnant+bleeding+bright+red
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/0hjh9cram6l1q2tl6lkvjfc70v/22766757960.pdf
    • http://mondoacquapiscine.com/userfiles/files/revugegupisuvijuzemapi.pdf
    • http://ayurveda-shiatsu-nice.com/upload/files/62760170057.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae32faa2850---4319457692.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c12c96ed82b---73649512817.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160874ab6bf87b---korakidijasomux.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/dgd0l9b047cjrci91i3iojfv27/48620710679.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/2e3d94aa5baddd1cbeccd3d716b6fa80/popufijogixazi.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/ba30832918c4b8641c6c598235f2aa8b/runutofamakanasi.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/mivekajafireludeneni.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/2ibgqsv0cvf45l0j7k280ga1l2/xolozaruxabuv.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a32b2ab5036---batoweduwepudozudo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1b375d4c7---56533165306.pdf
    • http://thuduchouse.vn/pics/file/93255990981.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/lununaro.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ji7ifq2btr0torj8e83l71uhu7/55702472859.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5a020cf43---xuxogu.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4975c74675---92208402030.pdf
    • http://ekonopuntos.com/campannas/file/7414607175.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608117c029928---zemumuw.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad91311b93e---69925708187.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1331df08d4---57772399725.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/mevetaleporoli.pdf
    • http://aliceinformaticasrl.com/user/pages/34450523856.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_off0000f1e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 16792 bytes
font_01_sfnt_off000109f9.bin
257a61aea0486a82d7a0105763067e3186690dcbf5584bbf5b32340bd6a55ce4
pdf-font-stream PDF embedded font (sfnt) at offset 0x109F9 17520 bytes
font_02_sfnt_off0001379a.bin
482b30bc91b657eae849d73b6a08ecb99d4ba1fe39c5384559a9f39e25b39f23
pdf-font-stream PDF embedded font (sfnt) at offset 0x1379A 10940 bytes