Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51ccba9d4d7dd9a…

MALICIOUS

PDF

97.7 KB Created: 2021-06-29 20:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 842be38236dbb0f88c99a72f69720af5 SHA-1: cbebce0aacfef56b55aa91a4bad8b32cb28bc38a SHA-256: f51ccba9d4d7dd9a66b8c964b04a073733a7f4726ce62d7fe8e97772328b1f67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the document functions as a link farm, directing users to various compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://artospace.com/pics/file/sapodotilobokira.pdf
    • http://jyjwqj.com/uploadfile/file///2021053122425190.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/47262338164.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/faa4df14d6b5b9bad715ec04ebd87df2/6309371539.pdf
    • http://polish-house.com/uploades/fckeditorfile/wozilakoluxive.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/79507e20af4fb5dddb2a69ecf3b54e4e/71601800250.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/e408ac54f66e825541043b3bb1ff1c05/kibenatigi.pdf
    • http://beachfirebrands.com/userfiles/file/xujasozej.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160874297774fa---38434611471.pdf
    • http://modern-pro.ru/files/file/paxurotalisa.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/9e43defc22227cef83fd1f85da8956d9/98167198048.pdf
    • http://morgancountyoh.com/userimages/64384819136.pdf
    • http://easternsheep.by/app/upload/file/1723163673.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa413a10938---dewexiguzipuzatigo.pdf
    • http://gift-founder.com/archive/upload/files/rilixa.pdf
    • http://ssaisarang.com/ckfinder/userfiles/files/newixuxewivox.pdf
    • http://kokocurry.gm/userfiles/file/52825096516.pdf
    • http://proxima-design.cz/files/file/fixekukegemunexusaviwiso.pdf
    • http://halmar.info/userfiles/file/44822490025.pdf
    • https://agentcctv.com/userfiles/file/6386840226.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88169c5632---vumebukadibir.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad88f310732---dafezozosivejimugu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=can+you+breed+legendaries+in+sword+and+shield
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001020a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 16792 bytes
font_01_sfnt_off00011a17.bin
643f11bf04f9dff6930f9ffa735b4a2b2da79e4b0dbbb32edbf0ac4b83193779
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A17 5876 bytes
font_02_sfnt_off00012f92.bin
b50220d7c080c2901c9d80061775fe689de29b241bb5a8ce9fe1ef38be32d3f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F92 10900 bytes
font_03_sfnt_off0001488b.bin
6f9776408ddfcf1450284a0945b3271bf2d6fefb6a8ab8d1963289615959639a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1488B 18188 bytes