Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e796a08893e57dc…

MALICIOUS

PDF

88.5 KB Created: 2021-09-04 20:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e859067146e2168beeb27a89411b750 SHA-1: f8df1a2b452fa323d03e242d0ec887506a2be951 SHA-256: 5e796a08893e57dc38169b045d13ff734840216ad248f5ef959f00a3b4bae20f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links pointing to compromised websites, including WordPress uploads, which are likely intended to host and distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of numerous external links, many on disposable hosting, suggests an attempt to obscure the ultimate destination of the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://lucidareemantenerepavimentifaidate.it/userfiles/files/11101340981.pdf In PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/95952583056.pdfIn PDF document text
    • http://hkwwta.org/userfiles/55141187561.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/zukevukejirexipa.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/472133841.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/4787525006.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/wivabidifovi.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb6e0671f6---zulesudoxituguxe.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/ac636de16dae5b447a4e025a82770451/43931615414.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/90161123910.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/zebutunopugubifipuz.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/fowomilevozokokipawidu.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/takafajegigivosenixawawaf.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/tojuba75dvdu3qhjutu1friqlf/fanogunumisalaz.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/6611026893.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/xerufadol.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a5c56b154---31598652762.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/sjeen613qhnckdlgei1vah1l70/29953074613.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3gvjqpfb8f7hv9q6toqp5pdar1/90246241079.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/kekuguwavefozek.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/r9odounf3l9s7dg8jitftc3t23/pokosomuzexafajinududof.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f2b39e399---49575450139.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/28545645871.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086b6053449e---masunafal.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835059a98b6---73095797301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=finite+mathematics+and+applied+calculus+6th+edition+solutions+pdfPDF link annotation
    • 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_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 11028 bytes
SHA-256: 9177e7fb48591c289f2229d1110fc5870c714c60dcfc7f335b6e20da9f5f80e9
font_01_sfnt_off00010b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AB 18580 bytes
SHA-256: 9df8414dcf320c1b7ad47fb0a88f6521126a41ea78cbf457d8cdea5045d8a5aa

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