Malicious PDF — malware analysis report

Static analysis result for SHA-256 11aa8c6e922df356…

MALICIOUS

PDF

89.4 KB Created: 2021-07-14 00:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ac76d3e29a089d5faecd90e586c3472 SHA-1: 5bb57286ac7041f230022e589532db922e6ee539 SHA-256: 11aa8c6e922df356bc9a07599c5fa39297c9cf795862776f70b8571277f3b145
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, many of which host other PDF files. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to other malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/41e128a59876b2cf8b4e27b2e61f452c/savadomarotodakugulag.pdf In PDF document text
    • https://et-auditing.com/userfiles/files/zovimazididivemo.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/nululifewusap.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d81f5414f1b---1052310389.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/djc86lov6ri0l6ukk9jliijfk6/47240136157.pdfIn PDF document text
    • http://gtshotel.it/images/file/nejukato.pdfIn PDF document text
    • http://hainfelderteich.at/69673170230.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d0ba6147d---25918598235.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1b6bf84a8183309a52a23a88659398d8/bevexamu.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/42341145157.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/junego.pdfIn PDF document text
    • https://posh.hr/files/migaxakuki.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/44061644936.pdfIn PDF document text
    • http://hkacca.com/userfiles/27650501919.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/be1jvm0skl92ib1vjqak71kqj7/17312660765.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/59e7f5821f787aa60d764050c25ff0cd/96664986250.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/835d357bdd46e28fb7c0d45e24fe82ee/55873434471.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/murekatemedutumume.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5ef358bf---93663473068.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e867dddb2---10425972984.pdfIn PDF document text
    • http://chmelo.hu/sites/default/files/file/28198694238.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160acdaa5e5da8---28001007299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=roleplay+gta+v+ps4PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 30232 bytes
SHA-256: ba7c59a124b43a419c690474f295bc13995cc481f9f7680ca3604c9e1f94fff4
font_01_sfnt_off0001286c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14083 10436 bytes
SHA-256: 91880145b047cd3464631e0e877ab3aaa7bfcf70b676153f8bf195a0578b1e53

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