Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e1d375b7f81a8d…

MALICIOUS

PDF

90.6 KB Created: 2021-07-22 15:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61b923c84f374c20a1963b8fd003c2d5 SHA-1: dd585b765a630241b0c53c350facd2cf1e61db28 SHA-256: 92e1d375b7f81a8dad1e2c1b97c0302261f9e86c16dbbbba888ace89d0d418d9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://sclifeguards.com/clients/16854/File/68915471653.pdf
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/botategarabam.pdf
    • http://tasteofruraleurope.eu/upload/File/27324946009.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869f809b5a3---riragokewamoke.pdf
    • http://fredericjean.net/oplusco/file/petezexegigigemakuko.pdf
    • http://studiocalcinoni.com/userfiles/files/7793219222.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c752a6150c1---59791636217.pdf
    • http://verduciautodemolizioni.it/userfiles/file/9788476928.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097174c06ebe---zimuzadigasifesonobuwetiw.pdf
    • http://toshiba-center.ru/uploads/files/6503212111.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/026066b34002f4ed57fd125293bed307/80835206026.pdf
    • https://samudra99.com/contents//files/74690867024.pdf
    • https://apotekatia.ba/fajlovi/91089660080.pdf
    • http://ankaser.com/userfiles/file/vimoriso.pdf
    • http://baikalspring.ru/ckfinder/userfiles/files/gipudidinejowimokavekur.pdf
    • https://tnmkor.com/FileData/ckfinder/files/20210705_419A8E752A4FD651.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffa1289961---vinidogepanixaluxasuz.pdf
    • http://morard-mcf.fr/data/Files/51286614881.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/klc272njkg8epnras32m0n63tp/4737616089.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5871aa7485---gonorodomevobaxumoxoribu.pdf
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17728852029.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=12.2+soil+degradation+and+conservation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010070.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 16792 bytes
font_01_sfnt_off00011887.bin
0e4a44bb7a471a9afeb6d9af2be652555331f00b67afb40685ee9cbd4095b179
pdf-font-stream PDF embedded font (sfnt) at offset 0x11887 10752 bytes
font_02_sfnt_off0001313b.bin
28b3d95c7d9e83b35fb6e6493acda8dd37d74c52ec37dde3ff5bf02987467a1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1313B 16464 bytes