Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4ba602959b0e8b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 10:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b17693c48482a80a185739c9c8e5c790 SHA-1: 038a84990e826d8ef743927a7b7c7d4135c88828 SHA-256: 7b4ba602959b0e8b2f0ebeec432b303e0b2f10ea858b63b391af1a38bd929e91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://krisoc.ru/uplcv?utm_term=keyword+free+search+tool PDF link annotation
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1hp062jggm3ke189stbblccdn5/kinaworakumidepujil.pdfIn PDF document text
    • https://mollis.rs/files/nokoluv.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/71289047399.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/nepuxobijosifurabetajen.pdfIn PDF document text
    • http://www.moyekolodin.com/files/61304365962.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/64440892505.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/74d068206af574c406f824e326219b9f/gusanix.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613354a64b3a6---gonopoletibuzok.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/fupul.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/fujati.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/lsqtu9v6b6ltqkibe09hu7lu14/8297596028.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/kosejulebekojatox.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/neguwelakima.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/73456630309.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/75608106854.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/3rj3uac6a8kv4kic092g3ku866/76438961146.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/xaniruvugupaberi.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210904173638.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/36363912447.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/61775240230.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/42741769287.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210905_747B3F0574D44A05.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/24401795185.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_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 10568 bytes
SHA-256: 189cc322b82d1dd95984da0023c715c47b4eac58d72ffdbc33e06508c6a83de7
font_01_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F92 17360 bytes
SHA-256: c186f7c9ca3f682d9a9f293fdb6c77fb2ae8b182a57003afe307cc133e234606

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