Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f68785564a92ee1…

MALICIOUS

PDF

88.4 KB Created: 2021-06-26 15:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56f39624ffd076f2be16b687a8afce76 SHA-1: b5a4c6ee546bec1feb55f1f78469b3bded73230a SHA-256: 4f68785564a92ee1d9430c986b10a9681a6ff81385652f65f5cfe7f6f8dc68c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to numerous external PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://orrizon.ru/images/file/75210771903.pdf
    • https://scanclean.bg/upload/ckfinder/files/zekalagiran.pdf
    • https://autosaloncenter.com/uploads/file/fomipu.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9f7489f8d---29799068270.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac04d956db---97989966823.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1fb4a1a7b---pisudikajoden.pdf
    • https://dbjadow.pl/attachments/file/29719062485.pdf
    • http://isystemlab.com/admin/ckfinder/userfiles/files/nifowapawudufe.pdf
    • http://sys-svinding.dk/userfiles/file/2456668755.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d9b9f5ca053d085eb54408a34fe62ffa/62599547873.pdf
    • http://bscartridge.com/pic/58720280310.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c76bacd5e30---33054028427.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/jaj8d87lj3rpvaadpqd1auufa7/vulijunovunuxosen.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb19dc75a4---tosanamelewatew.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/f12bfdceefc597437fd76871c174c0e6/89222317339.pdf
    • http://morard-mcf.fr/data/Files/76812027501.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2e8619d74d04b9c6de069aaf41ff1244/telizuwof.pdf
    • http://automsystem.com/UploadFile/file/20210528091453124.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/aa34187c1597fa873603d5d57e5f95ed/zatakavelajejix.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/da7c070b646d836f414c1427e30dbde0/tosajojujojofi.pdf
    • https://anjingliar2.com/contents//files/61317460053.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c4f226bc---33028036080.pdf
    • https://maximatrimony.com/ckfinder/userfiles/files/bowumumun.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71561e4aee---73375750828.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/27a416f2a811d53fc4f51347471bdc4d/tiwitexosuvegivodupo.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608a60d646009---vawajufesitufegewerokar.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=idioms+exercises+with+answers
    • 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_off0000f6c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 16792 bytes
font_01_sfnt_off00010ed8.bin
4e6bb874064b61270cf33af889ef013f5cb78e81caf80f3ad6d757f98777bec4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED8 10728 bytes
font_02_sfnt_off0001275d.bin
3a8d9da91bcf61f49b2af1463330598ea074dfd8efd77eb1a0394c1720312fbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1275D 17176 bytes