Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e85dfd6ba3e3f4a…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 00:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92c1f37b77555b1e8288d90e3733b7e5 SHA-1: 328befe325c7af9defe696d282182d9422c9eacc SHA-256: 8e85dfd6ba3e3f4a507ba651295228568f256449e893106374543ec4ebbb7b01
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=best+lan+wifi+multiplayer+games+for+android PDF link annotation
    • http://worshipedia.mobi/sites/default/files/file/sovopunijazi.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/8330926478.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/10880265003.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/fimomajowo.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/0a61r530hhekd8teqbn2e0rb6s/47838198341.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/mukexudedizafexiwirate.pdfIn PDF document text
    • http://simonide.org/userfiles/file/zevazeputifelujoxatifi.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/40284752223.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/dimizup.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/dosinira.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/34263631179.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/ponipebiropa.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/50276861884.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/fudemowabafexifisoperazar.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/vuzedevuwubex.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/rekijowokizalavod.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/8694b254d17f1f7413b4f9e9e07c0331/60083153191.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/kuzaferosija.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/ponawiribedavusus.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/vetazagi.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/198722422.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614146a71cf2e---84258796314.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613236cb4349e---zuvuzurasepoviketu.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_off0000b24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24E 11196 bytes
SHA-256: d83660d0e9226152a2bf779cd7a778e546f51a462b7d83407debe39d500593cb
font_01_sfnt_off0000cc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE471 15820 bytes
SHA-256: 6ad561c45d4ebb11fe0090cee97def7581d2b2cf4907c7005449daacea412a6d

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