Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa12a524af53143e…

MALICIOUS

PDF

110.7 KB Created: 2021-06-25 17:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb1230f93c9c83511dce8e8181ff3109 SHA-1: 119f9da460eb883d83dd164e06c086ff09271ad8 SHA-256: aa12a524af53143eb824b8018e03f2f0bfd42924102d7627ddce86f368ac4414
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d46fff32138---51333889620.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/46bb7f7ee367317683fc5702d7f14a63/29268232211.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/6g8le46001bsud2j0godv1vi71/paxezixezezovit.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd16db271f---gotab.pdf
    • https://egokituz.org/files/galeria/files/528855604.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becc257a3c3---jezupoz.pdf
    • http://xetaihyundai.net/upload/files/88840185712.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c12099a9d---verabi.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aadcc0256---22523319458.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728ee382b39---48585879572.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/7q5nbkockpavfrvc9tqspq2hjj/8594412641.pdf
    • http://sarlampa.ru/upload_picture/kesariluliroke.pdf
    • https://jobtiara.com/files/files/62321314330.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/b20e0c5a8f746a322388fdec26b6b035/70747005583.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/479bf0c6124390bc5ad20c348f61cff4/vetevosetireter.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+core+diameter+of+a+step+index+single+mode+fiber+is+usually+of+the+range
    • 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_off000146e0.bin
80ecd20c28bc5d054e7ec5908d6a39b856d6cef9354aacad6a7a0bd190d9c764		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146E0 19416 bytes
font_01_sfnt_off00017af3.bin
5dc12b1c8b4fdee535baa9e60343a8e52211719ec82ca2051623442d7bf8381f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17AF3 11484 bytes
font_02_sfnt_off00019591.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19591 16792 bytes

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