Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7249051a6dcfec…

MALICIOUS

PDF

82.9 KB Created: 2021-07-03 10:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3488c7a3fbf5a458375a67fa682f31d1 SHA-1: 96f14c4895ad9573deee8ffc082086458260a533 SHA-256: 1b7249051a6dcfeca916bddb86f79cc888bc39d7da746bb8c100ad8083a07347
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/0m9u856gf9qj6u3b0rphp5dmdb/16848966078.pdf
    • http://smartwealthhk.com/userfiles/kapuroguwo.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607726ef858c4---22560320075.pdf
    • http://chiangmai-clean.com/user_img/files/33500917740.pdf
    • https://dolmalatrek.com/userfiles/file/41384759781.pdf
    • http://dailyliving.nl/ckfinder/userfiles/files/dexosofomosisobip.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/81922887084.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c5ca0b66e---74095003045.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2554a94c2---xakufabuguwugevadopil.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607961d1a22b3---worimuneboxi.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/0451a7cedb8a33ee48dd31b2a8f7f14d/wizapigexezifidazudamu.pdf
    • https://aimhc.com/userfiles/file/45247382935.pdf
    • https://floraplant.gr/FCKeditor/userimages/file/78359819485.pdf
    • http://www.awakohchang.com/image/upload/File/8953376148.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/1554bbcb442d620c58868b33dee734b5/lorubiviropowewuve.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797cdd8d194---kidekumefana.pdf
    • http://adance0112.com/upfile/editor/file/juseritewijofemiv.pdf
    • http://nct-vn.com/userfiles/file/baxovetu.pdf
    • http://n2nlah.org/UserFiles/file/xalavajupupu.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/6a17716db426e63fc88b23d339609220/93222894119.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e78ce8e5b---musulokit.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f602930a7c0e497a3643fef8642b7d6/33972856125.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=staph+yeast+infection
    • 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_off0000e573.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE573 16792 bytes
font_01_sfnt_off0000fd8a.bin
8525864b39daf08551e33bef6129d4a84be1272b5366e2a56017fe8d596971c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 10620 bytes
font_02_sfnt_off000115cc.bin
3003e654b8c102c99eae032e741bf68804bda093fbaa84243030ac1d803251cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x115CC 16364 bytes