Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2bf9e5e3ea39c3…

MALICIOUS

PDF

108.3 KB Created: 2021-09-17 22:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c18acbd9d96aaa8ffff3e4277503eef SHA-1: 4d681d45e609be56357ee11bfd3bddf29a4cab8a SHA-256: bc2bf9e5e3ea39c3e90f66aceaec7a3de131a29a60666618ebcd6439d70b1c6b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of these links suggests an intent to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://partetesal.ir/data/file/11695816852.pdf
    • http://xhzhengli.com/upload/21031270472.pdf
    • https://7mark3t2-7aya.com/contents/files/josapabe.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ad269a35a---72944945720.pdf
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/95014774543.pdf
    • http://goldenpeak.it/userfiles/files/lisefimudazusijopusumewut.pdf
    • http://nhuaduongnhapkhauaz.info/upload/files/55423047975.pdf
    • https://anandamsanyal.com/userfiles/file/vobumofuvojoxibub.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/c8704b7a71c73e35d5efbb87d7112d72/nixulesusevelosanijek.pdf
    • http://bortran.com/upload/image/file/20210912033534.pdf
    • http://bobas24.pl/Upload/file/migotaguvotumetimupugetan.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442409ecf0e---lozidagoxexaturaripovani.pdf
    • http://www.centralperdana.com/file/43474036257.pdf
    • http://flex-link.cn/uploadfiles/files/77020301614.pdf
    • https://infiniteprospects.com/FCKeditor/file/47760031356.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427dfa159dc---tizumutajulexaxerawuk.pdf
    • http://crm333.com/documentos/file/kugotikukimiti.pdf
    • http://golfvillageonline.com/userfiles/file/79926041047.pdf
    • https://nhaccugiare24h.com/uploads/userfiles/file/wewesexiwajativilurap.pdf
    • http://chekeeh.ir/basefile/chekeehir/files/vufixed.pdf
    • http://imreelectric.sk/uploads/file/zelosezobolowo.pdf
    • https://alev.az/userfiles/file/zobivizupafupuwitutisar.pdf
    • http://truhlarstvisollner.cz/data/file/juwalanevekumutagokigaki.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=terraria+character+editor+android
    • 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_off00014161.bin
7723188ecfc7d5233ada55bd40425f1f5f5563f4efab9bbc5e8e78d569958081		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14161 19308 bytes
font_01_sfnt_off00017481.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17481 16792 bytes
font_02_sfnt_off00018c98.bin
c00aa914b309cf75254835f94680dbf8cc34258abc3198f09b2d61d0c74ece90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18C98 10216 bytes

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