Malicious PDF — malware analysis report

Static analysis result for SHA-256 8576324a79bf39ce…

MALICIOUS

PDF

98.7 KB Created: 2021-06-26 02:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aee1ebe243e4f1dcae5b434af827b124 SHA-1: 28f0067dd9bf769b0d9ac3dd0ff0369c431e9a17 SHA-256: 8576324a79bf39ce88a4d654a72f3dcd9e611354cc37d14e743e1c4d817e6a50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that may embed JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=simple+application+letter+for+sales+representative
    • http://aiswaryamatrimonials.com/fck_uploads/file/23909194915.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075b4bcdc678---95706963670.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082754409591---90791498712.pdf
    • https://dcoderesearch.com/uploads/lezinibogadutiz.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c315162646---mefamasopaboluxuwikigopu.pdf
    • http://banglenhospital.com/UserFiles/File/gufogakovidofe.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a04a4535e---4688878653.pdf
    • https://privatecambodiatour.com/userfiles/file/85326717927.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c990ce5d595eb076b4403a22c066c217/najuvapuzukesiziwulijula.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/900ad43dd7a4738a724e595191974372/newekubuzokuputupesigamav.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/27873335096.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073e34243b17---tolujazodoji.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/govinofugixesufitujax.pdf
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56873066580.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16082408514485---49549678088.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c122827c4fd---mopugejoxugowa.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c421a2dd0---venasumukutoxetarakexowol.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c4d4bb671---fafulu.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072c4b37d857---fefodepa.pdf
    • http://aodaibooking.com/FileData/ckfinder/files/20210609_7FF6B07C49993ECE.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8a6de7e39---ridaxelosadoxegabu.pdf
    • http://martonelektro.hu/files/file/31424256396.pdf
    • http://lbtech.kr/upfile/files/nutili.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/54060491874.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ccad2bd6b---79849426118.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/123d515f2c7f25633694a9ab365d3e67/vivizisolekesizaleji.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_off00011e06.bin
0d0eab36be3d66fac462f554fef2c567cc9b407a30f61d621cb0bb6bcc21366e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E06 17668 bytes
font_01_sfnt_off00014c32.bin
f2b7f8dba4cfbf38fb072392f22031ab54fdd79e9aa34e391440d254fbc3254c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C32 10780 bytes
font_02_sfnt_off00016500.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16500 16792 bytes

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