Malicious PDF — malware analysis report

Static analysis result for SHA-256 745286837c992b97…

MALICIOUS

PDF

85.5 KB Created: 2021-09-20 04:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dbe8981560c1e64eeb289aa4dd8d9d20 SHA-1: a2a356672f213f66b3e041e072ceb64d5e88bb2a SHA-256: 745286837c992b977682ab11f058b89ec9bbe8beb9ae9084e3b58d3c321794b2
156 Risk Score

Malware Insights

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

The 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 potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=samsung+galaxy+s8+stock+rom PDF link annotation
    • http://i-akparat.kz/ckfinder/userfiles/files/25444669051.pdfIn PDF document text
    • http://dd-eng.com/files/files/69792410468.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/gasijus.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/7vpc116ojed9e5ctjvcu6k5q65/depulenaz.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/xawisokafinuwefubos.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/kugixodefad.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xakuzamakosuzibika.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/gativajowisuwisak.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/51085959443.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/kalovalipebogekaziriwu.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/gobidoxite.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/15494955368.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/49139743067.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/pijuzominotuxumaniwo.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/juturosatesifala.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f1ed288c9---13994689553.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/nogujajupa.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/60358648094.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0a4fe6b5f8f4a424705bb1d886b098cc/92423007390.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/87557646191.pdfIn PDF document text
    • http://davcpundri.com/css/file/sewuzelezegu.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/zemokabomewifamu.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/vbu56dub390imon6f7vsfokmif/65010402825.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/60930598818.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_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 18740 bytes
SHA-256: 6e274bd2ede41dd08f3736d0ad476aa97bdcdb2ed90a37cba30fb367a159078a
font_01_sfnt_off00011675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11675 11040 bytes
SHA-256: 9baf9a17c61a5231ce8a04d5c266faf8bc222051b2b83677f36634d42fe41155
font_02_sfnt_off00013032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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