Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a0c8dc379d13dc…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 14:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 696082b5efe9fd9e8dbe9e66734ad00a SHA-1: d2f61e7db70a2036479ffbb5c45d79e39ff5060a SHA-256: 95a0c8dc379d13dc9665fa5a98587b922d0bf91dd2788109ef1511353be69c27
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests an intent to distribute malicious content or phish users via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://topenglish.sk/app/webroot/gallery/files/vidunuwovud.pdf
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/66606429206.pdf
    • http://jobcred.com/rk/jobcred/uploads/image/file/bekuwonuzofe.pdf
    • http://zit-tech.com/userfiles/files/10197287353.pdf
    • http://carzip.biz/files/uploads/files/2076854245.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f25e03f724---nisogenabij.pdf
    • http://www.heksan.com.pl/file/64060177846.pdf
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/58214077663.pdf
    • http://newbiesites.com/userfiles/file/sajisenabajaxalegijumufe.pdf
    • http://orthodoxvaidikasanghom.org/userfiles/file/93265294702.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/34272f43b1e672fefaa93f8e1497cd1a/komopofodisifavituj.pdf
    • http://dolekkoyum.com/admin/UserFiles/file/mezagisozudakuni.pdf
    • http://mebel-moscow.com/content/xuploadimages/file/dabun.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6ed1cb73---25826869258.pdf
    • https://seedomoretravel.com/files/files/fosoloromamonufadodopaz.pdf
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/21205751591.pdf
    • http://japanbizkorea.com/userData/ebizro_board/file/67059090206.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/007b13bf5a831130a7e8503f64dd11c2/62374581058.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161374c007b94a---62899305401.pdf
    • http://websurin.net/UserFiles/File/lamupakizujowidibux.pdf
    • http://enewind.com/pliki/file/41223466492.pdf
    • http://dtyxbpzx.com/filespath/files/20210918071923.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=a+quiet+place+part+2+release+date
    • 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_off0000d60a.bin
44b61c328992d0c985d5b8c41523efcf65fd39535b2eb6052b26ed767b94cabc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD60A 18960 bytes
font_01_sfnt_off000107c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 16792 bytes
font_02_sfnt_off00011fd9.bin
7559a99b43472f0a34c5aa04c2042cf1322696dc6b562dcbab410fc34abd7e8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD9 10632 bytes

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