Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c88f9301cdb13e…

MALICIOUS

PDF

100.4 KB Created: 2021-07-20 10:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3412c2a71c6b6817814465ffd79d75a SHA-1: 6c5521a34e0ee8f54f02f397abe9a50b5bc54a35 SHA-256: 50c88f9301cdb13e24c3a7db04abd7379a2c1e4ffae176a81c67e34e7be8a804
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload storage, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted, but the link farm structure is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://elegune.net/files/galeria/files/4325632869.pdf In PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/zidobumane.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/7d73a194b5b35db698a754422e1863b7/88085070101.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/6accdcd31c7c40d48e58deda44ab76cd/wiwaz.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/45457355288.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/c3c31b5fb2c8e132eba25cfea4fdee70/86164644.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/5a41cqvgnpepr4qepq20br6al6/nafiwupodupar.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/94034497430.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0244c911f3---wigufog.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/roduzokavabizagas.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c28dc1fc3---27612094577.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099567befcc0---83253162605.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901d0350d22---13930438018.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080976054e04---79406052072.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/1900e3667b977eb104fa65a26a39886b/73615584632.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/77849569980.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/a1d0754f0bd96a33377a09c547c063ae/98229651289.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/vomifidewefupojerabasiz.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/e39e12ddbaf565520aa2f12504246620/46655923535.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c47332cd---8104511966.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16c3abb0d---80154064437.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d5a567cb7---mijisimegokipekuwefaj.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/1ef7740824f81229d01d7e20ba365511/sinilozofizavasowibarom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=bolin+meets+tophPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12873 17352 bytes
SHA-256: b80673f75e1a4cc3d36a2e59c84e21512cd21482f9218574f7dc67c0f6b7969e
font_01_sfnt_off000155cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DE3 10308 bytes
SHA-256: d7319440007dca14f9d3d00655405976c49d0777e64fc4122b8a66b6ac14a7fa

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