Malicious PDF — malware analysis report

Static analysis result for SHA-256 c911d55fe0b2e53b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 13:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 126fff5dc2d0cfbcc332b44f38f397d9 SHA-1: 4ef8768fb7da9adac1f7ceba2cb08ddb971243fb SHA-256: c911d55fe0b2e53b2f1c6be524871ea9816ec7642172f8db19d6ea8c19bf7389
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs hosted on compromised CMS platforms and disposable domains. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may leverage embedded JavaScript or other exploits to redirect users, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c333ad89506f260471cf5565ac0050b4/liduxefirokurosebi.pdf In PDF document text
    • http://dogable.de/userfiles/file/26693556508.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/68191963942.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/86828437673.pdfIn PDF document text
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/fovizanomu.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610998843b297---kosupiwosugotizobadupe.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/028177512cd050174c0ef6a534fc1df2/golozaxekogifutowizedaz.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b21cad972---kobejawularekijosekigo.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/o5l5hdf9557o0stc71n5gbt0t2/44503294474.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/ruliga.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/poretavagejetenutu.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/tesegu.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa8867b503---temibuwabuna.pdfIn PDF document text
    • http://hrudolf.com/userfiles/zigikexaxawurodelipowa.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610a0063854d3---40744646513.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/rujikabunurasoru.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d241354f35e---91758824461.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6b47e6dc0---jakirepinijedobabibilojag.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/39838577193.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/tasolizufajinozib.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/xuxagenegekulanovinid.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce9d83702d---88021121807.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/4199268036.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/gomijerikozuxukamam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=1+more+chancePDF 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_off0000d4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C9 10044 bytes
SHA-256: 1c78ed6988d17934ba626818fa79d03a26e74793da949d6eb7d1baceb6a209c3
font_01_sfnt_off0000eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 21324 bytes
SHA-256: 6114d797fd36c45e217ffdc3d99d3898e5b04d6f72f8aa34b926bbc961bae371
font_02_sfnt_off0001225b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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