Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8ea6d857205f15…

MALICIOUS

PDF

85.1 KB Created: 2021-07-08 04:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc6619dc6fcc2409c8ef42259c7cab0b SHA-1: f3596a1822df3ea3ccdb02b1059b2f889836b0aa SHA-256: dc8ea6d857205f15b1fb5d5af97b61ae22f90f48cf3976ea3f1ff15d45d6bdfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to exploit user interaction via malicious links.

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 http://www.awakohchang.com/image/upload/File/7728644023.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798f4366cb5---55027831157.pdf
    • http://hitecds.com/userfiles/file/44666323017.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/86916306328.pdf
    • http://fotografoenricogiampieri.it/userfiles/files/wegopati.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/4f557240c33b4417b6d3c7a30d81e7e3/79397002082.pdf
    • https://jurad.eu/files/file/vukebizomo.pdf
    • https://justbuymeds.net/userfiles/file/rolabal.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608521bc708b5---jizijawowex.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/83860149439.pdf
    • http://voszveszprem.hu/_user/file/dobelukiga.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d050e90105f---tiboxulupibatuk.pdf
    • http://bclgrouptt.com/userfiles/file/25842988801.pdf
    • http://ccforum.kr/uploads/file/1623149664.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c76f7321b6---bokoke.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbba6df27b---49752291521.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/5c35ebde78dd0594e4e353240c22a475/46362455270.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3ca418e34---wabifeb.pdf
    • https://clubsportedinburgh.org/userfiles/files/46646176754.pdf
    • http://oishisushigd.com/uploads/files/69889904983.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/6fe645a7b66a6b2dc8a9ce2fe66878ab/5586045516.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/u2sk8m9bci2olcgqft09q6a1q6/fadazumi.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077959e0f771---47384427360.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d464b46a1---siwomepeg.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=two+types+of+cerebrovascular+accident
    • 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_off0000e92b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 16792 bytes
font_01_sfnt_off0001013d.bin
50d26438d88a8a8f6d90e6d12cd6706f25e271a59e74fc985a6e5a1e16681260
pdf-font-stream PDF embedded font (sfnt) at offset 0x1013D 16876 bytes
font_02_sfnt_off00012d43.bin
59efa3b397811583193287b43f05f7e04bebd6546911fe983f4783e555ba378c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D43 11080 bytes