Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c010da3ffc46e4…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 18:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ddf4236b002740439da03343a3eb7f3c SHA-1: d97f481b249a9bca8158bfae34f5ca82d7fd19f5 SHA-256: 08c010da3ffc46e49bfbbd07f4b312705ba16325a864cba3e3d75553ab90183f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to compromised or disposable hosting, suggesting a phishing or redirection scheme. The presence of multiple PDF-specific heuristics related to URI and link farms reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://ises.ca/phpsites/vertical_living/uploads/file/zodaluneru.pdf In PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/83snvec2ia0ce60b1bbkrnijp9/58363401067.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/wojogixepivefinonoz.pdfIn PDF document text
    • https://besi.co/ckfinder/userfiles/files/84302562844.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/tezaraxisa.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/7jk5s2jpk8cr12bsahlph2r798/15922077391.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/61435052169.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/29178837508.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ed32f1294---59163313696.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/padevuje.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/wewimalalujilarujilof.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fa0fea798b9f451775ab2172ab845080/laxixiburenologode.pdfIn PDF document text
    • https://amblamy.ee/upload/file/ponosojixedukelupupibero.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/80836316510.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/gokoporobasitulakogazodov.pdfIn PDF document text
    • https://starbox.fr/img/files/52717262318.pdfIn PDF document text
    • https://matratva.in/userfiles/file/49634082293.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/72708414629.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/91624943118.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/dufedemukovilatelep.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/25943121550.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles//files/gamevavareki.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/20838247266.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/88855986196.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/16170827860.pdfIn PDF document text
    • http://lblussana.it/images/file/wifusej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=christ+in+song+hymnal+pdfPDF 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_off0000e348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE348 17240 bytes
SHA-256: 5398605c14cfc30ae2187c3d9c806b44a2ded21cf1453ef76fbd763fd9da1b6a
font_01_sfnt_off00011001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12818 10960 bytes
SHA-256: 50f120f1f4faf1e276f197211c63bfbd4b09400ed45583138ec6f3c13112c264

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