Malicious PDF — malware analysis report

Static analysis result for SHA-256 2077808b36407530…

MALICIOUS

PDF

83.5 KB Created: 2021-07-16 03:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c95d454c93ad4db2d10bb2eded9e3a9b SHA-1: 7e460c89a14b3833f6d27903680126762048b5c5 SHA-256: 2077808b36407530c7ce7fe58a5515757b3f2d8231e5b8d17aeec6a29049dc92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This suggests an attempt to distribute malicious content or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://infrabud.eu/fckpliki/file/77873346780.pdf
    • https://louvre.lv/res/wysiwyg/file/mulirexaxelurewelutevipup.pdf
    • http://alwaysfavorentertainment.com/clients/879371/File/julok.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d43adec7c---7002699978.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/1c956f722329e956954d9ac47cbaee86/pagujawipe.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2d3da58e3b0cfe5d6c49834942dc2670/86929004822.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/23c705ac0e704d952a16a123fa39826d/79690035330.pdf
    • http://greenmodels.ru/uploads/files/76981171892.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c25c5b6643---depavawigoliduvakunew.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608da5d5f405b---37833277161.pdf
    • https://luminex.pl/upload/file/31401841060.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/77d4f270f5dee087dc3212ba9093ce05/resowovowetokodekojadax.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/f2bbaa334f390896d8bb983bb2d3470b/5068420580.pdf
    • http://nakakinpump.kr/fckeditor/upload/file/xemijuxizutume.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/42e9d43c5a3f62daeb4da61d2723a468/fumaxak.pdf
    • http://ecogestval.com/userfiles/file/xofabefuz.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a442c4c2eca---tidukeduvemuse.pdf
    • https://publicbridge.pl/userfiles/file/jiwem.pdf
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sipevibefalevabuxomo.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090927540a8c---sejafonefudidofanonudoz.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/vr4mtansk6d5g12te0mtf47oem/xalobukozu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+does+your+water+break+on+its+own
    • 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_off0000e499.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE499 16792 bytes
font_01_sfnt_off0000fcab.bin
0b95f8855daee5806389da5477c3c09690f19d88eb62efd1d1cd80e2a27dd700
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAB 16816 bytes
font_02_sfnt_off000127fb.bin
b82c008bceeee9734f5c5c336b73bbc75960bd7d4b7f49872aaa90210afeb510
pdf-font-stream PDF embedded font (sfnt) at offset 0x127FB 10716 bytes