Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f9759c9156606f…

MALICIOUS

PDF

71.3 KB Created: 2021-09-01 16:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 70c3c8f4065250e7a9b1d4ad986c6bf0 SHA-1: b0c93bd26becc7ea26e0b721ebb7655d2b499afc SHA-256: 08f9759c9156606f3d5b9de20d90c1f7c0682d42a80379ab34c73c0de9124c7b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to lure users to malicious sites. The embedded URLs, while some are marked benign, contribute to the overall pattern of redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608671c6b3d2c---17921711502.pdf In PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/409bbce5e66778b20e794f1404908f3e/18251606141.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/t4sam6psdhja83qommpcgspout/tonezefutelogef.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/84677466828.pdfIn PDF document text
    • https://iword.de/userfiles/file/kebimufenonexajitozew.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-30/20210730011524185507.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/l79gnmtd77vrenungt2o5nl3n7/bomonigofozi.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/q94m8ivtju1f9j60r186g6pk52/jumolesej.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/uxujirovovimepaja.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/39904152606.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d465da01ee36c13c2eb2daf8caf289c0/56268167514.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16089a8e79a54b---31888461237.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16112478aa030b---84818012536.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/vizekumavotawixurike.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1627117573.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/rexiduwidonaka.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/womukegidimoka.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/85638794861.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf80794373---sajanijazorabuzojedise.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/76541104497.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/4773555410.pdfIn PDF document text
    • http://tencanpowder.com/d/files/ragane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=subnautica+battery+cell+chargerPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A0 10652 bytes
SHA-256: a2d8dfb7068cbe8f059057460aaef0e7fb15d85300226dc79132054c4b406b91
font_01_sfnt_off0000d100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD100 15260 bytes
SHA-256: b38f62daf265c46b14f9c842708625ee171ad96a62802fac28809b3c44b76890
font_02_sfnt_off0000f783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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