Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c96cbedc4b963cd…

MALICIOUS

PDF

90.2 KB Created: 2021-07-01 16:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35a4720a034b20fb4eb35d2f6770aad8 SHA-1: 8ee8d564958267d3c33160bd4ccc488838641e50 SHA-256: 5c96cbedc4b963cd34ce3c98e0df872cfae348138b536399176ee2845c9e4cb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as containing a link farm hosted on compromised WordPress sites, with many distinct hosts and URLs. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were extracted, the presence of numerous URLs pointing to potentially malicious content suggests an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f7320f237---23308877570.pdf In PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/b01c558b830a67609932b9c00f64aa59/60232694310.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/semugef.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/tabanebarifukipuku.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/95470366542.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/bukorepekuduw.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/b17fa5396972cfd3959e231bff59bbba/45643707314.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/d7gqhn15p4g3vgu813lc5per7s/32630250741.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/31891710062.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/0uah1rp2sh586v9mt54draqmpp/xuxodofakatetuw.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de1d903cf5---28477379619.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4683716833---42449021534.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/82506403430.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/belewevegegabolawojip.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609122c860b82---ragewepiremutajix.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098459a0d0cc---pugowimikupe.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f81fe6fa26---rovavujiwiwafasugiziso.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/14269b03281cdc0bb50c0acfef583586/gukimagefa.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/bf134c182edca25e7ee89c949df8f869/zebilutunatofesuz.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/vpiij4mpf4f9m7bam0b82mc0qd/vimamixorodovomigu.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/sokixigazijesefotu.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7acacd872---zogomefodapulelade.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/decfbd3d0c267fec2fce818b5bdf34a1/burajedoxaju.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/15c6c46652faa2ee07165b431f46d1e0/wafarebuvirizuxodovowudep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=meaning+of+committed+in+punjabiPDF 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_off0000fd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 11012 bytes
SHA-256: 98d5b598e3eb12e19f1e33a80a81b27db858e61184c84ce1d93a1c10ec55aa91
font_01_sfnt_off0001167c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167C 17436 bytes
SHA-256: b71df63dcf22618e4eb5a07cb49e56de093a179b4f7beb337188958d01b6d60c
font_02_sfnt_off00014357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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