Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc9813b67ce79c9…

MALICIOUS

PDF

106.4 KB Created: 2021-07-01 11:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9a73e70ddfcc0b32a9f2deba941ad83 SHA-1: afa91bc4e305cdda45b61e7007b9f3a1b08d253a SHA-256: 2fc9813b67ce79c97fddcaf968e00fec5d4d6f1fd18905a5281237455727c4f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://ketchas.ru/uplcv?utm_term=the+incorrect+statement+for+the+sulphur+atom+of+zns+is
    • http://beiwendq.com//data/attachment/file/likiperugezakew.pdf
    • https://imagebuzz.net/ckfinder/userfiles/files/latukesitojomilobira.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609276f58119a---disawezixo.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd538f20b---531584423.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/61atvq1232533bbeaptvlarfo5/lejejeroderid.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f0c4a6ab---dexesipogilodejamepimod.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/2dfed1d01abf50e221405454040123ef/80020931818.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/s90vci2v8brqoo6r65slm53312/41655285565.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2dab734cc452e7600f0430c82cee075b/romowanoda.pdf
    • https://aartipalette.com/userfiles/file/pupivunuxexexebetin.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/b74f4682e497e944f7d2517736b02050/25807753149.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-6-19/20210619173336496131.pdf
    • https://tvmreza.tv/ckfinder/userfiles/files/90164356348.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ffc750578---saliwagufunifotefewazep.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098675b41202---tofodibo.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/5f67f536720ff3279dba6d13ab0c0ea0/bigijuwa.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a32b12064---18376065751.pdf
    • http://okzawidow.pl/img/upload/files/14562001653.pdf
    • http://curry-box-deluxe.de/userfiles/file/44838963728.pdf
    • http://pulsarvn.com/media/ftp/file/71190165863.pdf
    • https://jxloanchien.com/style/postimage/file/7278969549.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b22621e6794c44a7622ecf30b0716473/42215487585.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160afb8cb9176e---jawiwerapajejeguxalones.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/b994684b1ba2b90b51ca3e06a3021c4a/21573149993.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/80599897595.pdf
    • http://asianmosaicnyc.com/userfiles/file/85907640214.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a067433127c---20412516477.pdf
    • 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_off000135c7.bin
a67db56b375c0312d61813ae3d1beba9be168e4e0e93bab6bda2951c398f2fa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135C7 10868 bytes
font_01_sfnt_off00014ec0.bin
3a691cf977421dc2e5f8141740b0f35f2f4a3413beb64c40d8513bcc7e41a9de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC0 19304 bytes
font_02_sfnt_off00018190.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18190 16792 bytes

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