Malicious PDF — malware analysis report

Static analysis result for SHA-256 7906cdb75ee1e3de…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 18:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5ca27a636c2195881b46f6a7be0e710e SHA-1: a84d4565ca86ac7bbe86901f21d1be8a33837397 SHA-256: 7906cdb75ee1e3dea61d172ca0823f287a40b32f9edb691f42005c962a7e6b51
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous URLs suggests an attempt to redirect users to potentially malicious sites for phishing or malware delivery.

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://huntic.ru/uplcv?utm_term=blowin+in+the+wind+chords+pdf PDF link annotation
    • https://alkalacarservice.com/public_html/userfiles/file/jigadadapekowetevepijus.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/renisuwikinumazif.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/purivevaxi.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/95933506467.pdfIn PDF document text
    • http://fitviewer.biz/files/file/24476446213.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609838e783380---xobemes.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/lurulutagutugelejufugi.pdfIn PDF document text
    • http://aroma--style.net/files/files/6415642704.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/toforefujisenefevuwa.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/21882602282.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/508c8098035944533fcd12d41d7854e7/158017870.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb354c21f4---monano.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/5409486527.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///kodolejarigusotijad.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/511bb2745e814bf3ca116563394c3624/17268827484.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/kepuvakebaxevusapum.pdfIn PDF document text
    • https://fallsplat.se/file/52810707883.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3d7249ed6---92007632153.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86da8575a---lilaxafigaxiwajefivuvono.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084f07bee995---timewal.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/36067552766.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0204098cf---sosidefifodode.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56134629557.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34fee47c4d---36104146281.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/94396639664.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_off0000d66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66C 20308 bytes
SHA-256: 0429151239216aced3d23b5464b3c38fc2be115edcba3ccb0d4ddbf21e84571a
font_01_sfnt_off00010b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B31 10692 bytes
SHA-256: cf71efd30b08216c254ba168906e708c62d91f25ba801fb4005988ce4c188c03
font_02_sfnt_off000123af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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