Malicious PDF — malware analysis report

Static analysis result for SHA-256 af918440c98922f6…

MALICIOUS

PDF

89.1 KB Created: 2021-07-30 18:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d9941018ffd836cd6b01222db472260 SHA-1: bb61c0c9c11e34886ab643c0e17379c95bee936e SHA-256: af918440c98922f6bfc5d41306f647e4519f2640171d0e09c83ac11c5d038e92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. The presence of external URI heuristics and link farm indicators suggests the PDF is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/8806029a7f6008eb05f86a1e6ff5d78c/kedufuvowenojipabi.pdf
    • http://beloezoloto.ru/userfiles/file/bapofaj.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/24a78fa45dc1903d8ac41f75aef6af19/67220179880.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085b85410fd1---lemexujurodazekukewif.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8e2f49002419832a2e800e1104d49b12/lexunedabobodekufepinijul.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5c0108c1a---tevizififopizegerobotod.pdf
    • http://prof-cosmetics.com/upload/files/12983752636.pdf
    • http://bawaconstructions.com/editorData/file/zuxarofuxumamibo.pdf
    • http://aotwresort.org/ckfinder/userfiles/files/rudur.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9a00jqj9n8dsidfg1ere74c6du/masaxug.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/8480fba52cf0dc8162fdd12c42d59547/sorizarel.pdf
    • http://suseefinance.com/userfiles/file/36921343146.pdf
    • http://alimentosldm.com/userfiles/file/2797780508.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/829t51625ob2r8nejdscembm8a/97676870272.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f2a7adbe9---79752469381.pdf
    • https://verandapattaya.com/userfiles/files/61710291480.pdf
    • http://kayamedbursa.com/userfiles/file/dawogunap.pdf
    • https://agrilaui.com/userfiles/file/23707413579.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abbcc4e070---pumomoxafilisuse.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/58e2e3e4878ccf1be31696d2577909e2/17647247692.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a5cf465fe5420f64de70c62f680a5520/labeluxibosoval.pdf
    • http://reicar.dk/userfiles/file/pabifefadagemel.pdf
    • https://bedandbreakfastchia.it/userfiles/file/62627973219.pdf
    • https://bmw-zona.ru/uploads/file/rigetubabozejopabeva.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d4a057680b5b42cf3541bdd68c7627f9/limifekizabanubinetojuk.pdf
    • http://interel-rus.ru/test/sites/default/files/file/zivomagipivuxamod.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cuantos+metros+cuadrados+tienen+10+acres
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f364.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 16792 bytes
font_01_sfnt_off00010b7b.bin
ae97cba610c8cb657e1f1df5b360aed923f76e61fe55bcab118e64a915ef91e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 10788 bytes
font_02_sfnt_off00012463.bin
c7e1b73d2ccd94e2ba14570ef08fc42bef0537a1591a16033b1df93b6ff9c3cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12463 18140 bytes