Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c387a4ce8508a8…

MALICIOUS

PDF

73.4 KB Created: 2021-09-02 00:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1e2cc0e32aeba12824a06276749f3d4 SHA-1: 5117bbea45ef5ea7a68543ccc00893b6f94674ae SHA-256: e7c387a4ce8508a8e15b983924d38f60f796f3570e3e943fbcac91c381b60f74
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised websites, many of which are hosted on disposable domains or use SEO manipulation tactics. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The file's structure suggests it's designed to lure users into clicking links that lead to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=how+to+find+the+area+of+a+region+bounded+by+two+curves PDF link annotation
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611651f46b2f6---duwekanuwexam.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f88a2ce9ccc---zitevego.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/81dbe2780efdd55a1e2829f9d18912f9/tilasuwerewevubutejuj.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c8818996d---17115138498.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/jabaxunese.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16074d8d2806cf---34463858739.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/rikovefaraganopuve.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d92eb537887b8ebed37622d948880d91/morawugu.pdfIn PDF document text
    • http://mamam.by/upload/File/file/zuferuluxawulewizezet.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/tafaxuva.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726a7a830eb---fewonoguxawab.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/89733118183.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/kiwizigonude.pdfIn PDF document text
    • http://standardamulet.com/files/files/74545609004.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfd7234288---82261616180.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/favapaterexosofazinavero.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/baad59c1cc53a9e16deba44776b949e7/xazuropozijemubusagit.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/75996991627.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609dae107ba82---96246951665.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fccf0aa3bc---somopevajod.pdfIn PDF document text
    • http://chinalabware.es/d/files/xetiwevamaxelobef.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/semumupivumaxovemibuxulo.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/xijokotixazob.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/97464368833.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_off0000b928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB928 11204 bytes
SHA-256: dbfba08d09b33626aab54d08955cc9dea5486db571e812556e4873dece7afd05
font_01_sfnt_off0000d326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD326 16308 bytes
SHA-256: 54a8071e2fef742ce173e77e97503670825fa489d6b1929857e630bfd3221803
font_02_sfnt_off0000fd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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