Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2ea26d733e8386…

MALICIOUS

PDF

78.7 KB Created: 2021-09-20 22:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6e3424826cecce85e757ae5e028c1e02 SHA-1: 37b3823a9a1d29f9801187e12a666c229d9ac2cd SHA-256: 9f2ea26d733e83866b57a36dec3faa2dd135bc315a25205ce44db3e5d67b24d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=jack+reacher+2+movie+online PDF link annotation
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a3d2a2acf096c572d84627bb22ead88f/5966140812.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/62089674418.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/64901175942.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/riturajilanukumubijekaj.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/dazitorenanive.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/sijaxokojudutorajevari.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4dcd0c7ab36b829b4b9328135e29730f/29521767454.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec90761468---fidijonalez.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/50817753666.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614733483e3a5---dibozinaleresu.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/sopunoropafinaxekodoxi.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/pokemepabilugajixoguw.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/51458624809.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/54937680296.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/96431367355.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/xavel.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/pivatipeze.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/jusulokarodaxezujona.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/tekafaju.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/jasipiwibadod.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/41305923085.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/9c908f3149e1fecc2f1be4620536a4b1/84526794526.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/zugim.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210918_58BD6DF06ABCBC3B.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_off0000ce0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 10500 bytes
SHA-256: 82e37d9108964221f884786c842a17ac4c6d36a0d6042244f95b5cbfbab620f5
font_02_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 18288 bytes
SHA-256: e7ad5dd4128b04b97f655645404d4b71012b3c4d22660b256041d4dcd6f60ac6

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