Malicious PDF — malware analysis report

Static analysis result for SHA-256 29efb4c54e3813ea…

MALICIOUS

PDF

95.0 KB Created: 2021-06-26 03:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01c26d20c977fac1c6d5acd2cb41b6be SHA-1: fd894fdb445c37cca750ff02780fa569e6db2b18 SHA-256: 29efb4c54e3813ea055afa0220e479bb644cb5dcf1b9741f64c447700ceebfec
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests an attempt to lure users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://crewmak.ru/uplcv?utm_term=phone+interview+questions+and+answers
    • http://cappellastudio.it/userfiles/files/23715268841.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/2d451e16d0d3275d4ec30494c84aaaef/68416466850.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/d712b38e76dd71c98ae76b8e3fe5f4dd/foberisikodesafuv.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607272cc1f0ad---guvukijuzanoposopog.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/d83377786fb3d41f65eaaf399fd012a8/32771989503.pdf
    • https://oddluzanie.net/userfiles/file/23149101731.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/7i1f0lva3dpgmqomfqc1i58qb8/rezujil.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cacae17947b---xojinuzokobimivilon.pdf
    • http://kanstm.com/ckupload/files/97160071296.pdf
    • https://bitree.ru/ckfinder/userfiles/files/72180999847.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/c1ed28a44b4e02deff17b0858ca08d1e/43361156846.pdf
    • http://tasarimak.net/ckfinder/userfiles/files/75145227460.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2ca4881b9---69528699134.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd26762649---numomowamupugurebabidud.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a3deeb478---68767576804.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b01cb35d75731841cf06e5c151f52023/vuzusibesogen.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082456adb173---komexaliwagapom.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d56cb3681b---11212343829.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc32e80e20---nidavelatugelara.pdf
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/xolerozonezipomomejebek.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2bf8afe4ddebc59adb8f6f5d555238f2/70416513152.pdf
    • http://wwpokebar.com/uploads/files/selib.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/h4d2khrq3qojj450rgta39a1n7/10648489376.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608046b18db88---ralulijaxazapowaporiv.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_off00010f8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8D 16792 bytes
font_01_sfnt_off0001279f.bin
09ca2846acb2d57fef2c763fe30405dcb3283cd4c4af5af531ac0c71f653ca86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1279F 17636 bytes
font_02_sfnt_off00015624.bin
b607127ba771254d8baf911d0dc0529c06b1d2ae6d0559c7944822bad13127bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15624 10696 bytes

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