Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5830606c3f8de59…

MALICIOUS

PDF

86.3 KB Created: 2021-09-15 17:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6195eead6fc06e03e4c15aa36cacb17e SHA-1: fb4dfd891bbde07ad642ac342f30eeec5b1d7ce3 SHA-256: e5830606c3f8de59ddd2f86ffe9ae92e5c6a773a9415599890cb14876fc78b47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting, likely to lure users into phishing scams or download further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, suggesting a tactic to obscure the true destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161343fa2793fa---watepememaxiworox.pdf In PDF document text
    • http://visusmarble.com/images_upload/files/47166086250.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/44341852606.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ea2723ba34a263f7c5d66c2257046904/51453899279.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/lazenesajimusonal.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/33333906975.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/disoxajekeradajenulezow.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/potutupulo.pdfIn PDF document text
    • http://vejwun.cz/images/32656609558.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/44674554726.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/06ge05l8r5fuodpo2d5vctvrgi/zelogufijumazezazetomu.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/24685075293.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/31592370770.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/vobusinisutanozarerasud.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351b8dc051f---gojibisadibibofalatede.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/94a2ca39f5ebd06c338fcbfa054166c6/xifojiw.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/6139e318b2097.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///nilok.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/80074876324.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/58028287907.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/53317892592.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/93105343207.pdfIn PDF document text
    • http://ssp.by/var/upload/54243116773.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/54849974809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=alone+season+1+episode+1PDF 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_off0000ea5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001026c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 19344 bytes
SHA-256: 17a56f0b9d338766bd068b47c13ccb7ec27fec0b774e48e6a3e08a7e92079eeb
font_02_sfnt_off00013431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13431 10220 bytes
SHA-256: 16ae09bf39c4a11fb17cf14a8fc294dc6f3be62707fd8b49b443aca3d57e24a7

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