Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e0c7a3d6569006…

MALICIOUS

PDF

103.6 KB Created: 2021-07-31 05:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5c0130a2317d0cbd06a492038029336a SHA-1: 14b2f483af40a173f6594e072052e01afb688f07 SHA-256: 41e0c7a3d6569006c69cbbc4f4af019fdf61bf3ce9ea959f5c5d0a2ecac41dd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/4469544caf1cb81d9b2a55abb1971b8b/72510836995.pdf In PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/kenirudifomog.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/2456809651.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/84441456880.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080bcbc50a7a---nenigunitatev.pdfIn PDF document text
    • https://rotherelectric.com/files/pudixovapetawujided.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160791c15478d8---viguguvipufenukobogejire.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/3093539558.pdfIn PDF document text
    • http://mesterek.net/tmp/sawinesipavosuguxawololo.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094768863f49---69172950024.pdfIn PDF document text
    • http://ccshecea.org/upload/files/gexumaxukizorom.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fe276b455---46736533716.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/13618fca619812868a97f717b559ca75/retulaxememekisi.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/11392848806.pdfIn PDF document text
    • https://topaldanang.com/uploads/image/files/18368016891.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/gusedofujolo.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/gerefifibejubusut.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/pedugume.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608977e88f391---58153963337.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cc1cd4317---jewigofufuxewomizeraf.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/17e7f3dcfc09ecb3d316025683286781/888737444.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ll7t4q84jfgt82gb74tkmbthgd/jamazidug.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/moxelezopo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089df5dd1b68---53289755451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=magnus+chase+and+the+sword+of+summer+charactersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000130b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B1 16860 bytes
SHA-256: 45e13403812777cae157a9b833d8c48f9484b6ade44c0aa289f99da10fce8904
font_02_sfnt_off000147f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F1 17576 bytes
SHA-256: c24d49ddce795085eb98d6a24f8db12ccb553dfe60bbf184e10d76b118da3efa
font_03_sfnt_off00017618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17618 10964 bytes
SHA-256: 9c2b94dc3f793df939aab6adf12676fd4f55c8c5152b67a26e9f7aed5f55e4ad

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