Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af436ef23da721b…

MALICIOUS

PDF

89.0 KB Created: 2021-07-18 16:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e657fc18afb3914452de3fd254c70868 SHA-1: d4423493f6be48da90b23d8c27ea541a90568d88 SHA-256: 8af436ef23da721bb28458a145bf01c3a8260984fb51ae7b8227b4469f79c511
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which are associated with compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160e53a5cdea21---marubisexivezudojexu.pdf
    • http://beiwendq.com//data/attachment/file/40784939714.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1bd4c10b---23803539223.pdf
    • http://piqiso.ru/userfiles/file/ledemikipinif.pdf
    • http://banphimchuot.com/userfiles/file/futipijofolikidu.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e2ded51607c8a0ee50335027265e3fdb/72066244562.pdf
    • http://nyett.hk/uploads/news/files/xadalovowetuwuket.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160965e21aee37---lixer.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcf2c5a106---234003309.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/3fd0548065cf6a29a5cfc23fc7414f0e/doxisumolurobuzodoloz.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16082d5f0a58e9---buxerutukupajimudozogone.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/f936fac1a98d83a6824d221b453fd689/bedawovagowurojamevad.pdf
    • https://rendiamovisibiliglinvisibili.org/file/divifawokaduraduruxive.pdf
    • http://thepnguyentran.com/media/ftp/file/59654546486.pdf
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/wawijokibomozuvevizuxewu.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/tpudgj8n4r95bmvvd1vp5hbhhh/32315184552.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de2c660fbd---lumaborare.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16071dc7b5ac45---tisaniredatipeka.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/leb9ecuqvgqn6tkohopjbijg1v/berilutufifejepo.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/83b31472148b80f36da68c0e1c86631c/78760993941.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6ef5dbaf1---53142488152.pdf
    • https://esz.jp/img/editor/files/nogaregabepegekixunafaso.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+help+my+friend+with+depression
    • 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_off0000fa63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA63 16792 bytes
font_01_sfnt_off0001127a.bin
442c2b3b25434bef110c5d18914184341e9e8c290032e859eb401e12a8f4b11b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1127A 10792 bytes
font_02_sfnt_off00012b22.bin
d395612315c3957d69f4a8abb05f9ae3b7432f846e0f42d334f9e0d41554e168
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B22 16756 bytes