Malicious PDF — malware analysis report

Static analysis result for SHA-256 91419f6f490ee1cf…

MALICIOUS

PDF

69.5 KB Created: 2021-09-04 09:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d4fd294e91c4ed504195c61324e4cabb SHA-1: e38a5b304c5b7a68c428db222d21b856d8b655f3 SHA-256: 91419f6f490ee1cf656bd676d2cb15c711f96b6a7eb3a466671b318161a873e0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a phishing trojan. It contains numerous links to external websites, some of which are hosted on compromised CMS platforms or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://colescastle.com/clients/875019/File/89254040830.pdf In PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/3b97164e9c6fa9ee6dc5f6cc123658bb/zoposixa.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/sujotila.pdfIn PDF document text
    • http://polipack.ru/content/file/vojixonig.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/zofofepuv.pdfIn PDF document text
    • http://biomehl.com/images/content/files/80302882164.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/wonigekojiberewomali.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/47172411207.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/boteluvafibufopewesuxix.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/f980a873bc88d6c7c6e94321109cdfa8/xapekoluwogu.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fc764339b---46642690743.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/6761172046.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/55061999778.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16082f9d5b9ffb---21873741181.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/86265524574.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/20325404492.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/dezusisajigipufezogajasov.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c64e0c148---vivowerez.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a84632195ce---23265539611.pdfIn PDF document text
    • http://headrepublic.pl/images/files/gidifubiwukaw.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/12476245510.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/depesin.pdfIn PDF document text
    • http://girl0229960192.com/upload/users/files/53799121238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=common+synonyms+and+antonyms+pdfPDF 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_off0000b473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB473 10432 bytes
SHA-256: 1f9dc1bb2b54877838bbe6043f92b0ef66f7342a32c8904de79a47a0f4fe262d
font_01_sfnt_off0000cc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1D 14380 bytes
SHA-256: 8f06cb2062158c5618fa7f0722dbff1a4f022777604776d4122ebf86a158ee60
font_02_sfnt_off0000f01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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