Malicious PDF — malware analysis report

Static analysis result for SHA-256 b466c7eab1d77ad4…

MALICIOUS

PDF

87.8 KB Created: 2021-06-30 06:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8828759d88b149e2ae4af4c6a7a16a6 SHA-1: 85577c48f4c1dc0ea31e66a6e741914afb17aa00 SHA-256: b466c7eab1d77ad4dc9488e2529356231102188904c81862055021dde8e8cfb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://ohcsi.com/ckfinder/userfiles/files/mupotof.pdf
    • https://hmanagement.net/userfiles/file/dorekojomapeg.pdf
    • http://ambvetfanini.eu/userfiles/files/80730670170.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160945690bb539---56123410383.pdf
    • http://panziofabian.hu/fck_kepek/34828654309.pdf
    • https://fotokeramika.bg/userfiles/file/mebebisakova.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607545f69f6a6---67555155589.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/b8dc940ea8e8cd065772610125037644/73135175079.pdf
    • http://uralinteh.com/uploads/files/gexufekaxa.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/tisomalezarefibijevuv.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3af70c78---tukegorolibuwo.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3577d6cd3e8ee565c847eefaddccc0bf/8822272076.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adba03cbf54---lonozubojo.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/17663da11f307988d34a2f4b4f4877d1/64600320141.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/uma7mtsrtt4can4oa0fontntgb/21485170323.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac25ae09fc---mafanupenabovotikapeme.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/833077c42e2569c6ec710961a38efcee/pizegu.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/9929bc017848e76beb5422c467b584dc/wivavadelotirulum.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/75350589815.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/7et117e0h7cnjirkjclnpi0u6t/mugugubibupixinelegor.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/0fd4d684c68d29dc9c0f0a1d71f74c07/xaposaxoseximutusupixuv.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98b4ed969---46677485515.pdf
    • http://congtyvima.com/images/Download/15553779220.pdf
    • https://aneri12.cz/res/file/10426053359.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/7ade6950122ca5d48a4b01e4b1608fd4/40942278954.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=rick+y+morty+way+back+home
    • 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_off0000e792.bin
e017c7ddcfcf7fbff8dbd05239de7504e0595ccdd72527c709b4a8eafd28e517		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 27960 bytes
font_01_sfnt_off00011f96.bin
5885b6c24dfb1d3a6fa91249424af3ab6562e1bdcd1541e74bbd81a4a241682a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F96 10656 bytes
font_02_sfnt_off00013822.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13822 16792 bytes

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