Malicious PDF — malware analysis report

Static analysis result for SHA-256 b511ebb6bf20733a…

MALICIOUS

PDF

92.2 KB Created: 2021-09-06 19:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 72e757d891af2e35cb001127edb9161c SHA-1: cff2e4f08e5ad806d38c4ab2655512b821b967ab SHA-256: b511ebb6bf20733a3e86960eaf0c7e95038725d5f8d210667ac3049aee417008
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, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely intended to lure users into phishing scams or to download further malware. The presence of multiple distinct hosts and UTM parameters suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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://queure.ru/uplcv?utm_term=bolt+pretension+ansys+pdf PDF link annotation
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/ac799bdc0418da8a1d99aad11860e5d2/wikan.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/33904e7767adb7da6b29fba57eaf77ce/desezawa.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608674c32c475---zadegivasupasuxolovo.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/72684113071.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202108241444598574.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d901275dd3---lilesawa.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16112c56406e6f---21381014539.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/suwigovoxat.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/66939426978.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/104707e33f06135abb9d8b9a9a3f9e28/mudubegexidorogenuxulu.pdfIn PDF document text
    • http://jogamiskolc.hu/ckfinder/userfiles/files/xegino.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6acad3e70a---jikenewefik.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a30020b8c---zakoxis.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/30335744313.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc7cbad9c7---fudapuzuxiborazugigifa.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/vokonurelu.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/75277438956.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8cbbcaef6---rizolugu.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/susimuv.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/vowenuvuv.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/37287788143.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/63095882292.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/vgo0iuj5oimeb7p4kns9abjov9/xivatiwavuvukawuwesez.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/xagixedijobinapiw.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7qn0bt2li7nerlmdkpcski8af4/86087211310.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/bepasiwofefukurokiri.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 10660 bytes
SHA-256: 0214c55196fdaa3da8b4e83ccbc4e94c2cb3a86dc4d5ebc3466baceaaa38f293
font_01_sfnt_off0000fa88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11299 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_03_sfnt_off00012824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12824 22748 bytes
SHA-256: 305fee36979dcade8abc39d7aee999370bb17009042e95749a5467b6d5d87c6a

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