Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c0ac3a193c49d2…

MALICIOUS

PDF

88.3 KB Created: 2021-06-28 16:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce5228b73227909ff4132703d8eba0f7 SHA-1: 65796304f017a9ff0dc3e227483bbfd79dc5fc4f SHA-256: 42c0ac3a193c49d25a54cf08222485435350736a10c8f5c84fa813bff989a5e6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, with a high-confidence heuristic identifying a link to an algorithmically-generated URL likely serving a malicious PDF. The presence of numerous links on disposable or compromised hosting, coupled with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution scheme. No scripts were extracted, but the document's structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laborke.ru/uplcv?utm_term=download+game+of+thrones+season+3
    • http://sushimura1.com/uploads/files/80641345482.pdf
    • http://ondrejkocar.cz/img/file/86077394193.pdf
    • https://oxi-dental.ro/imagini_ws/jumizitinabogivelatod.pdf
    • http://transbur.ru/admin/ckfinder/userfiles/files/wifimuruxemoj.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a648b7f011c---78761400782.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8dffed1f5---kamipazuxibiliseruxajubu.pdf
    • http://billedbutikken.dk/articlefiles/file/wufodibusikakava.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/9fa2c76e2a1d134e8e5a327210a4b170/tilemufojapuzodujar.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/cufprk5hudbh3oc8r2k52bmh1u/zebodu.pdf
    • http://rld-carbon.ru/file/gosix.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/b69bbc7f77ed65977159b4a5515269d7/8825273351.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/0a301fc0640776a102ad329335130679/sobuxike.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ef525fd40---faxadesavozojenigexi.pdf
    • http://auxerretv.com/content/public/file/dezovodevudebud.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160812333a66d5---ruginaze.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609885b83c93b---budusi.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d55e74fe1a---99128748223.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/afd6e9269678ce14df297fbd8b7c6744/68584619652.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a90d66717---69997202488.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/uvc6749qnkve15vr2l8ecp8u7o/majobolurugala.pdf
    • http://bociany.sk/media/file/niduxuwebupaxodowibak.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/349fdbc825191d789c301191ecc4746b/4245579771.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba77baaf0e6---82831338509.pdf
    • http://tanphatinst.com/vietkiendo/upload/file/99967002698.pdf
    • http://shop-cartuning.pl/userfiles/file/tekawaxowewefigilawo.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/nilaxatotuxuwomifozipubuk.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c6d07f27e---jesajidisajumu.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a851854e6---lujonuxi.pdf
    • 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_off0000f55b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 16792 bytes
font_01_sfnt_off00010d72.bin
394358515be1b41de87f861c2507eccae65c0dd24a6bc3578b92347bf46caf3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D72 10968 bytes
font_02_sfnt_off000126a0.bin
5bdbcf48b7ae86d445ebb3d859d75adfd0f80753c26f5071bbc06e83d37f7063		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126A0 17304 bytes

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