Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a0299db9535902…

MALICIOUS

PDF

114.4 KB Created: 2021-09-03 17:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 36dc62b5fb633b83208175d21ddfa2f6 SHA-1: f56a7ad56eeca7cf483ba2138466beee9132755f SHA-256: 81a0299db95359021f7a8adfd5ec87ab5df4dac0a7a3cc4ee0231fde9f983517
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure.

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 https://ketchas.ru/uplcv?utm_term=quantum+physics+pdf+in+telugu PDF link annotation
    • http://ke-sen.com/userfiles/file/1628779067.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f968eeed4c7---3246528552.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/egr0maesv27nutr8q2l0bdn3cl/likibotesosodoxikul.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/vavapavino.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/5285837275.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210520124410_mmw6j1.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/pofotiradazo.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/40542409753.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/xivegixominub.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/61099059601.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/52774971007.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608669a008c01---xilefebemasetotevufaluti.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be472ae7f6---wipesitirudasaronadisu.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/dixojasigogemomisutom.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ebv6p8q62m6ndftu8ficv9e0tt/93770423771.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/ponagokoxenozid.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/aqs4jqmvj88t5dgn06emi23p9q/36561926578.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21dbf1707e---25686064741.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vomanofogamubom.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/97392869549.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/wutew.pdfIn PDF document text
    • 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_off000157a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157A4 11120 bytes
SHA-256: 3e3c237930678ec90e814096e3ff923af350e2d6e61ddc0a22d4071ecbe877db
font_01_sfnt_off00017153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17153 19356 bytes
SHA-256: 3c9d9db7d4c93b9eb608fd9f14894566a897aafe36a2abcc1777712cb8f9bb2d
font_02_sfnt_off0001a3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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