Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d342428fe9e9e7…

MALICIOUS

PDF

69.6 KB Created: 2021-10-03 09:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f684d3b271598b2c2d1c6dea8e8aabb6 SHA-1: d8a8b5bd553be3474d1d51cf4fd9ca38de23a605 SHA-256: a5d342428fe9e9e77b5908af6d0252565fdbc2f0c9b70bdc6f25bc4027697680
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. It functions as a link farm, containing numerous URLs that point to external resources, many of which are hosted on compromised websites or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such domains to obscure the true destination. The presence of multiple external URIs suggests an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=colonial+dry+cleaners PDF link annotation
    • http://kamennykoberec.eu/editor_uploads/system/files/puguduvawuwusopif.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/99957570836.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/pegowar.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/78029714973.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161338c99196c3---98827952961.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/33522647756.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/0e1c0445f57683e379140c5362d4f472/wasidexekev.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/92822550667.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/1505694015.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210924_E2325C5A0FA79495.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/zowogexopop.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/mofirunogo.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/fotejixebugir.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/1jgmng5ffc1oe1hkvg67pduq1a/31090134019.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/29740255671.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/35537265838.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/53324982520.pdfIn PDF document text
    • http://esteel.my/userfiles/file/78871750685.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/wixorinapovofej.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/172606832.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/jodidajejunasubopize.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/92814196527.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/94056157397.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156e8b15e076---48151150261.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_off0000b07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07E 10412 bytes
SHA-256: 726e351e559269a4fbb226ae1de893029a429c1e66529f39b7d18c2649683027
font_01_sfnt_off0000c82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82D 16236 bytes
SHA-256: bfc4e7d549a3e654dff9e5b2399cc8cd2cc586e3a01769071611943ce8669fe7
font_02_sfnt_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.