Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b1c3fb4ae4bf07…

MALICIOUS

PDF

89.4 KB Created: 2021-07-21 02:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f41908ea8c728e4f379d2135a264ee59 SHA-1: e1d7f86231a51105a5e985290c2cd8f64ac3fd5c SHA-256: 80b1c3fb4ae4bf07f21bb6810aa28ef5b240b04d14e9852a03e773be4fb23ace
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for further malware delivery or phishing. The PDF structure and embedded URLs suggest an attempt to exploit user trust through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/ruwunamepele.pdf In PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/46297209507.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b7aa6feda026fe98a8cbde6c4b8fd59a/41553987995.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160962cf8d8ad7---82998585774.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/lavixofajozepofojekajet.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/62663136760d09bd2d981e.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe21876a8d---bupijuvetalutomin.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/52464216.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/desenikarivebazavarej.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/lomivamujetusuj.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/tajix.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/besitojuvewikes.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/18k7ka0mvd2vi3tll453os33t5/4537555213.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/obfo2hkhh87koc3mulo6auuv0i/91470909203.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/p8g6hl9djjhbcuhcp5aavapsl5/61158045461.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609015765386c---xodevivirunofojifotefat.pdfIn PDF document text
    • http://kunbot.com/upload/files/43752916845.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/zuzerovuzatomixojum.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b293a9815---1795279232.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/97623867179.pdfIn PDF document text
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/difulosakirilo.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a26c29ebf2e---29243124109.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/63490523538.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/bapojoroxesejowilim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+add+white+outline+to+imagePDF 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_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 10604 bytes
SHA-256: 74b8f7d9b970df2b2939d245b0a5475289735e7b423d8e3ac0375ec5e2110f5a
font_01_sfnt_off00011374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B86 17124 bytes
SHA-256: 77e6d89774defd6382b372fbdbed281de69e053298895cd875b172df8af4c2a5