Malicious PDF — malware analysis report

Static analysis result for SHA-256 f908426be6c8c120…

MALICIOUS

PDF

76.8 KB Created: 2021-07-01 17:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 628086dee452480a2635dc9dd8f35c5a SHA-1: bdd198bb54a01b5a209644e22ba425bedf4a67e7 SHA-256: f908426be6c8c12010161d66827c9c34bc2aee6b052deaec7464d6a4c1d567ec
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. The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting it's used for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns are consistent with known phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://coretry.ru/uplcv?utm_term=red+rose+with+butterfly+tattoo
    • https://stopserv.ru/files/file/10168719103.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607893a0bb216---vejaninabovagefaxegowe.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/df482dbe020c969a664b3129570d796a/wipusurubidufowar.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16086be2f274d3---siwutek.pdf
    • http://skrabl.pl/www/rpbd/fck/file/vawewobinofezabedetax.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/23468099783.pdf
    • http://cichanski.com/Upload/file/54920112499.pdf
    • https://akproauto.net/nbloom/fckuploads/file/josurarewetamumokumapun.pdf
    • https://dagvandearchitectuur.be/_files/file/18448636494.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9453172ef---ripiravadagijerune.pdf
    • http://teakdeck.pl/files/file/jezutuvowoxaxubugosijonig.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a15b6bdc0---pedokakerutobezawofaka.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/nblcc47nb8hbi49u7u176b024b/sufudidofupenur.pdf
    • http://silesiacapital.eu/data/file/mofekozatomadokinoz.pdf
    • http://chpcentre.com/files/file/zugumu.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a888c317406---suzabolovigobakug.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/167bbfe0491751bdb732a69c321c3940/63023441660.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160da85a8be65f---sepimuderixogoz.pdf
    • http://emirates-offshore.com/uploads/image/file/81832096553.pdf
    • http://ahcxdq.com/uploads/file/01051030952.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a309d53c0---26035740886.pdf
    • 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_off0000cbf9.bin
d9d4c24808b62b59358ba6d992b7cf091aa047e6b12929ce700dbc97d3a312b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF9 15848 bytes
font_01_sfnt_off0000f4cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 16792 bytes
font_02_sfnt_off00010ce6.bin
b932e704d0521b1fa4787aca2e4c21a4dd2338fe105093885f74ed60db3fc1c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE6 10832 bytes