Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b015cf66faeab3c…

MALICIOUS

PDF

75.7 KB Created: 2021-09-04 06:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d3335b58d89fd20ea759409faaf09178 SHA-1: a46c94ad2e3913b30399777eb2e0f6cbdecee42a SHA-256: 6b015cf66faeab3c1b89949b8c898a4d3fa0d6c5dcf1c3c241970a39c6f39ec6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. It functions as a link farm, directing users to various URLs hosted on compromised WordPress sites and disposable domains, likely to facilitate further malicious activity. The presence of external URIs and link farm characteristics strongly suggests an attempt to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://garglob.ru/uplcv?utm_term=hasil+bahtsul+masail+pdf PDF link annotation
    • http://aaaexpressac.com/userfiles/file/64073465103.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e53776945---gerisuronizamopekagemobe.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ba04bc767---nimukexadodalaripebi.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/bc84aa772eb2d8f54bf8dca987782d06/durusokezujiw.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/3780ed26e43e8cd67601c33b5c5ac2c6/68373889441.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/75374267883.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/sq2rso33dah08f5fado16ukhnl/gisazejarafol.pdfIn PDF document text
    • https://airbays.com/userfiles/file/babodowedewati.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e7fcf8c7b56---dajuvekegiluzekawupepamaz.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/31640200578.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210829032152.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a49c8856aa---23460475950.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/56371101802.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/71475599161.pdfIn PDF document text
    • http://atek-ent.com/upload/file/putalinigokiba.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/bafokixuwuboro.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/bodenese.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076dff40cdc9---fatipesarer.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608139366fbf3---74928223075.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf92ba193a9---72437886271.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/8cfee88519a2c3cceeb468b37b18bd18/63784894723.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_off0000c12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12D 18424 bytes
SHA-256: 06c8e281b4906f62fe4bd91512be354640696a4d7e170a1bf6304c09ead9390c
font_01_sfnt_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10982 10536 bytes
SHA-256: 8235a6bf350c0ee70276209fc3b289916005b51be14366296d6aa4e024965b36

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