Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbd8e863de9dfe1…

MALICIOUS

PDF

75.2 KB Created: 2021-08-29 04:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2c42bb73f641a6dffeaf922481dc1e6f SHA-1: 55efbda5dc2d18b2efa926e251a6b706091e43fd SHA-256: fbbd8e863de9dfe1113af3b0ea779b786152ae53b619e228bd20bf30ea0727eb
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains malicious content. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to phishing or malware download sites. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://iweldbot.com/ckfinder/pho/files/gukonarugapojatazu.pdf In PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/mebifubaxezuwuf.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccaf5d600d---58265576068.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/95573493146.pdfIn PDF document text
    • http://faradbox.pl/files/file/jebejopinun.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6d636976b---loledawejasudonisim.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f24f391751a---93022272957.pdfIn PDF document text
    • http://barksdalereunions.com/clients/869108/File/nedanoxupilomutu.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/zemufabojujowev.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/fanixegujorixisek.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210804104416.pdfIn PDF document text
    • https://shidoremicrosys.com/media/kubikavuwaju.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160e943a5aa924---lewatunutuwaj.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900cc3c02cf---pupagajuzigamupotetap.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608712c58866a---93866618954.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/78344134208.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/xidibefujubabir.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fk49gakir8ks0u14nedu4g4f33/rijur.pdfIn PDF document text
    • http://tochalco.com/uploads/files/49261748848.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kelutajisokut.pdfIn PDF document text
    • http://nfc.soo.jp/file/82294626360.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/42d4ecc3d68301f57047bd1f0bc46df6/jidazexiziv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=moral+quotes+in+marathiPDF 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_off0000c03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03C 10612 bytes
SHA-256: 247882ff42d8651a5038257734d56436556fedb3e1bdcb874013967cafaffff2
font_01_sfnt_off0000d848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD848 17552 bytes
SHA-256: d3bb2969647ea860476fb679a36f5efd374fc997729da3ded386fc2e9e8ecbe4
font_02_sfnt_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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