Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21dc9ac5feba592…

MALICIOUS

PDF

94.0 KB Created: 2021-07-19 01:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92ad67c5dd890892d4b92a6d7a2f5b66 SHA-1: 9eb7fb852989a920ce23fb9980b5ad3f9af9d723 SHA-256: f21dc9ac5feba592d169284defe9b471a684dab33fe34a5792d1db0ae19ef394
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • 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 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://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160d376fc4c3b5---xaraxiligagoguvaf.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cfb7a11ae---50543269728.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/rurewopipelute.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f46db56f3---23029127914.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0f6d99580---52785739920.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/5b921530fcd5c359feb52be360944cef/pokudiwagufofuletokaz.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/bc923777105d396e052b39b3a50158bc/penukejonopilekuxiw.pdf
    • http://allnatureint.com/userfiles/file/94684520023.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d44d982b4---bukevupus.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1a6d4d782---30072970113.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607adfcd7aeb0---77571945812.pdf
    • https://bestcoloringpages.com/userfiles/file/rilara.pdf
    • http://doktor-okonski.pl/uploadimg/file/42548857875.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/e89ef3707ed10214b8ac38341e0a4903/vegixigafosoraguzasajuxud.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607be80e85408---89150205480.pdf
    • http://uniquehotelsolutions.com/files/others/94762133182.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/1v2ohvbfr27cu34uqgophhf87b/pezejededunov.pdf
    • http://booklandbooks.com/userfiles/file/69429956650.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092554c11ed0---99958779381.pdf
    • http://alkanboya.com/files/file///zejir.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/fe6c07de776073361bb872c3fcc0e218/51989056313.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5778e6064---92979708886.pdf
    • http://opuspoint.com/ckfinder/userfiles/files/jalatedilojuzetisiwesuxak.pdf
    • http://bioscipublisher.com/files/upfiles/file/23964261379.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/1vkv0l3cuu5i3vtv0e8ugtughg/gozafiwuvejif.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=bacon+wrapped+chicken+skewers
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f542.bin
96beda739c247c5dd714aabaf59dcf206f76e5e3f0ff08755b05033f0ffedba2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 10700 bytes
font_01_sfnt_off00010dcb.bin
2f3617bf527fb6d19b45abae83718a11e8e75a51a8a186ffbfe0a154c7138554
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCB 17656 bytes
font_02_sfnt_off00013c14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C14 16792 bytes
font_03_sfnt_off00015425.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x15425 16312 bytes