Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88ca7facda41f48…

MALICIOUS

PDF

81.2 KB Created: 2021-10-07 10:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1698833cd026fc53bb24ae2219ed3d5a SHA-1: 269099bc469877d5c25e045cf1f48dbbe378b13a SHA-256: c88ca7facda41f480ec856520a8adc3b2c47a587355c7afe33e7d4e73b226c1b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://knx-shop.ru/admin/ckfinder/userfiles/files/68704636624.pdf
    • https://eastmangroupllc.net/ckfinder/userfiles/files/dotidipebojetomazoxajo.pdf
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/74007573387.pdf
    • http://studioingegneriavaragnolo.com/userfiles/files/zisobasesabiwupina.pdf
    • http://sweet-sugar.de/images/uploadedimages/file/reneledusuzixovozajobobot.pdf
    • http://salukool.ee/upload/userfiles/file/gowunarolefanozuxumixe.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161383fb16befa---xuresuru.pdf
    • https://accidentmatters.com/ckfinder/userfiles/files/mapowojubawawovebaduko.pdf
    • http://apexnepaltravel.com/userfiles/file/85959897065.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161560661c97b4---vozezizakutefu.pdf
    • http://tavio.su/files/file/86870190629.pdf
    • https://mayphotocopydogia.com/upload/files/luferulujadekidu.pdf
    • http://iseveranscopy.com/upload/editor/file/sujoseparoz.pdf
    • http://jiangsutravel.kr/userfiles/files/20210928_061618.pdf
    • http://ilsungwarehouse.com/userData/ebizro_board/file/69712389829.pdf
    • http://gymostrov.eu/gymostrov/userfiles/file/xoxuladunovuxid.pdf
    • http://allamericannursing.com/userfiles/file/20224886665.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/007862ca8e76df620822885bf04b0101/nivesubodozazowu.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8a59af6f113845467ad3345b222e0296/786593005.pdf
    • http://meble-tk.pl/userfiles/file/751333567.pdf
    • https://kfk-dekoration.dk/images/uploadedimages/file/luwuniribolegakixekib.pdf
    • https://telorgabus.com/contents/files/xafevidumejodenesuro.pdf
    • http://vaness-sens.fr/ckfinder/userfiles/files/60987645464.pdf
    • https://beta.nhatthiengroup.com/files/uploaded/files/62710013670.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8998f979b57e4147fd0238477c0ed6b7/juwogajozipera.pdf
    • https://mkontroll.hu/File/kixalemexakodif.pdf
    • http://tokyosushilohaus.com/uploads/files/felaponasoxatatidumipijin.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+fourth+agreement+book+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_off0000d433.bin
887f5210e61a3da379e616ae4a8ef7cdf715299786f10e2a030d830faebf1549
pdf-font-stream PDF embedded font (sfnt) at offset 0xD433 10936 bytes
font_01_sfnt_off0000eced.bin
4287038139114f2b0fbef2b103736a51a78b3db09938f6b8caf67a50f9012842
pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 18984 bytes
font_02_sfnt_off00011ed6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED6 16792 bytes