Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc26c171d6a77c9f…

MALICIOUS

PDF

84.8 KB Created: 2021-06-25 18:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67c8c695a3a99d7566c3bb56d4eeb52c SHA-1: 9205ec2ef2045273f78f9c69465d753c71e80fcc SHA-256: cc26c171d6a77c9f1c04a654b3c4c45d95c8855d788307db0c21fdf06623fb93
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, a common lure for phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a technique used to bypass gateway security. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2a90685247fc5d6e9b75aeb0b9e4deb5/leruvetokogef.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/28318566955.pdf
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/19616056240.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a5ce16cf5---duxajavoxat.pdf
    • http://currycornersugarland.com/admin/images/file/niwasupexaw.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c526a3cbb---wojoladojexesamosi.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e740e31f0ac3992f49da422c5a8ec70a/mujutogolopetobinafamijo.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/360c58c72dfd15d30c76fb69ce8d32c5/juvogopa.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607506f360639---fibapupulanami.pdf
    • http://aftckwt.com/uploads/file/gamogazeruxosarelosafuz.pdf
    • http://architects-desk.com/uploadsfile/57491325076.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/od89igq5pn3pnvtp3abt7toig1/48872351112.pdf
    • http://anatolianlgs.com/userfiles/file/tesaze.pdf
    • https://schmitz.cz/res/file/feluj.pdf
    • https://forumhrdbekasi.com/webroot/userfiles/files/24412590174.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/a766d2de29aa71a90d523162c2f746d5/66606800580.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0fd49ec5c---33446468068.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c8c60b7ea---17729838117.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16099bec4d55f8---dasokowewedomaru.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844bca28380---fisuguvi.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607def391a4a8---40826299363.pdf
    • https://ooo-kenk.ru/userfiles/file/91399616963.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/940f6b95a61858e6bcdb0da74fa9688b/84123586271.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/efabedfa897dbe638ec0ffc5922a7dff/napokataniwekonuxawaz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=kick+off+example+sentence
    • 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_off0000e818.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 16792 bytes
font_01_sfnt_off0001002f.bin
d07a9bb459ebf7ef0011e832438d2703ac760f511be866f3cf7f352535f3cc80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 10724 bytes
font_02_sfnt_off000118d6.bin
caf57c5b5089c0d7cf1387606f36b86806d2c3d18a0d2822204caf24e4aadc66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 17520 bytes

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