Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a62849aeea35d7c…

MALICIOUS

PDF

88.4 KB Created: 2021-09-03 04:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a2c4ef75a83d79df5f19ac60539fbf50 SHA-1: e37ac15f6a14a1ad291b34839f306aef736697a5 SHA-256: 6a62849aeea35d7c6b6ddc5d71807a6811fda98ac36ede41033baeaee1aa20e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or 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 nature of the links and the PDF structure suggest it's a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://infrive.ru/uplcv?utm_term=contagious+jonah+berger+free+pdf PDF link annotation
    • http://www.puhito.hu/uploads/98955118249.pdfIn PDF document text
    • http://tfforming.ru/d/files/bafov.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/titolefutunemab.pdfIn PDF document text
    • https://kuepancong.com/contents//files/joraketawukakixevilutev.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/0ca3iidtde2io2p2p2gosol8kc/berutojuxevezidokijerivon.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/7f3805c4714b1b3519c98256a96f1451/64601072754.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085b0a5e0171---93619019053.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3ee25550c---texemopawamedom.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/54524198223.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/gewusiwu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c6b720381---15807469208.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/64983729370.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/3f5a51b97538ea7d4b88e31625ef0937/mepepivomo.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a934f03ee1c---51985611489.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/08-28-00-59-19-13.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/10206857782.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/jedotepelaxexuvaxutiloli.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/fewedowezifedonokav.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dff8810b2---26169439054.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/kaputagapilekatibuwefafe.pdfIn PDF document text
    • https://titishop.co/upload/files/91320162386.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/rejojafodiz.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_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 11132 bytes
SHA-256: 3dd6f121da76f3d12b2f1826536968e23d08136c2ca7bb3c55e987280df97458
font_01_sfnt_off00010c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12459 18636 bytes
SHA-256: e41538d76d3245a20837319dfd90effd4bcf26a1af02c1ddb826dd2f58898dbe