Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd2115447b66a41…

MALICIOUS

PDF

90.9 KB Created: 2021-09-01 10:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1b3157b40675541f6deb04ee1ab58a08 SHA-1: 9a6886d504347d061846a5fa9a0e452fa0c58768 SHA-256: 5dd2115447b66a4111c0c742a7e192d1ba60098ea9be32e496c6e555cf642f75
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised websites. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://aven.su/userfiles/file/fugap.pdf In PDF document text
    • http://adria-ex.com/images/blog//file/wejowopusupavoguxeraxekul.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a916ad619---64655251665.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081e2a61cebb---4342705620.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0d0b2455e790844b4993b76d0553af52/74261402513.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/lebobijosa.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/45502331229.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607547f92d53f---98458236029.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/lijik.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/23318498903.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/55366179790.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/radilipinenudabijotagudi.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/valewejurufomiregad.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/sonixikudomewopejazelo.pdfIn PDF document text
    • http://abpaluso.com/upload/file/3407782344.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/75361978317.pdfIn PDF document text
    • https://latework.cz/soubory/27549883948.pdfIn PDF document text
    • http://fxmeat.com/upload/file/53cd7eda27030356b69bfd16f8e6cd03.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/56104860218.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/56861570745.pdfIn PDF document text
    • http://nensi.si/upload/file/povenogiwafa.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ec740aee6---29922234807.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16128c63933cea---85568652594.pdfIn PDF document text
    • http://vaynhe.com/upload/files/96818021233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+does+cousin+once+removedPDF 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_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 10748 bytes
SHA-256: af058369732ac64ce2aba656b99debc29557f30efc0b59001faf72cab6ffcaf6
font_01_sfnt_off000112e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E0 19328 bytes
SHA-256: acc096b56cc173a460025f27e0d06f051c46540c941712a670ef898e961f83e3
font_02_sfnt_off00014528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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