Malicious PDF — malware analysis report

Static analysis result for SHA-256 076ced9aa4f7ccbe…

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 13:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c8c9c446b4829f0bb00163c931f05243 SHA-1: dfbf30eeecc35c1ebfe8d51c459486db91244dd3 SHA-256: 076ced9aa4f7ccbebfc2ec791a85413b98b5908ff0e85d83a4651cd0ec4778de
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to unsafe content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://senarathgroup.lk/assets/media/file/niziwen.pdf In PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5502964ae---39831810483.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d28634691---92838026381.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2915fc158b---76517212777.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/3ad15ae62ab124bd02ce672899377738/pikuzivodowada.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/8kte4j9ugibk63ogjd3pir44f7/83622544545.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/0d8f382860b6dc378c155dba6194ef23/gemovijimog.pdfIn PDF document text
    • https://m3csrl.com/file/moxenigag.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba6696028d---lutalanefiluwemevubamim.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f43a74abe4b---batatodajivuj.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/h7h06b2husdirlc778tj5jb1ri/zalivetubidagizukazag.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/92522741259.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/zovigu.pdfIn PDF document text
    • https://xistenze.com/files/files/76035208620.pdfIn PDF document text
    • http://terrietanaka.com/library/files/90844665025.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab281b39f96---tokamaragawerawotubi.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e24a319fa---11559794904.pdfIn PDF document text
    • http://freeski.hu/freeski/file/duditofadumesupolaraxajum.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/96817545403.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/57255285734.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/wobenexerezabobedis.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/vgkr2e0c9aj3denojdac89disa/10688043390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ashp+handbook+on+injectable+drugs+pdfPDF link annotation
    • 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_off0000b958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16A 17072 bytes
SHA-256: 03d8d2097296edcb5f3677812b96f84547751bd77a96afcfbe5a706e0cbcc0a3
font_02_sfnt_off0000fdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 11344 bytes
SHA-256: bfcfc655151bdecf01c97c452bbfe84e243efcb1a2ccac04214a335542ab40e4

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