Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c518e74557d270…

MALICIOUS

PDF

74.7 KB Created: 2021-09-07 00:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c183eadbbd06e9ed7d3cd5bf03af5771 SHA-1: bbb0ab16b8c480e24222e03d98853119800e7b1b SHA-256: 26c518e74557d27051cc3ca51053ef2a009174d41979dd39b4a5365985ff3b9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs suggest an attempt to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c014a8621c---78759668294.pdf In PDF document text
    • http://computer-rudolstadt.de/upload/file/lisowoturigajesebufed.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/40157063431.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/69856049564.pdfIn PDF document text
    • http://e-hematologica.com/users/file/51911194391.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/18249060494.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8bb938e92abf54abeed98d759d3c4a22/pufudilomav.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/c9a2f7485023b8e66c12a60426076141/44398776428.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/16c6fdf0f8b52115f38fcab6d76aa092/69918376561.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/104874839.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/rarovififexoribugugawudad.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/veaq1j6ob323euof0v8sjegi84/50334732379.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/94499182554.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/96444619989.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/mibapovidijuwujo.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/45063215579.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5e656ddac---xobozubedowijamabe.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/8e5klbe7feu66am50t20p4r5g0/denuwe.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/80963912798.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/03646e1f8b6bd6ad70773c8cff06524d/taragoxosu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b18fcc97be3---sibifefituradizes.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/moduzisuvoxegalin.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e5760cbc5f---45918084501.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/nufube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=insurance+in+bangladesh+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC199 10872 bytes
SHA-256: 1a77ea21ad4ef6ce3f0e87bbb943b5a88ae48a6cfda4d1ff02b480665e4dd72a
font_01_sfnt_off0000da2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 16744 bytes
SHA-256: 2c30760f21d42ad4a210503eebd2da589ee9319a7c491d10eec8730b6c0515ed

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