Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eee824c88e7db88…

MALICIOUS

PDF

84.2 KB Created: 2021-06-30 00:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b95f61d22f63c0670e9521df4a97f366 SHA-1: 6e99ca36552765f9505a6c53636e414472ac3070 SHA-256: 1eee824c88e7db88714c98a5594f6b565ce72540460d7a24d6772e403bb0536b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://aitrans.org/UploadFile/file/F1202105121051182775.pdf
    • https://pasarantogelsatu.com/contents//files/78737756358.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4466200be89f250449a3d0ff127d7b9a/jilekekerifiperififarex.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a32a2a66d90---86406702067.pdf
    • http://bettaletroom.com/file_media/file_image/file/22512200127.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/27cfd1ae4eefa97f5cdea6118d239f02/75895111981.pdf
    • http://asupuro.com/upload/save_image/files/2681550169.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608182966c212---zepuxugaxep.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb16e199360---jupikigumurulivakedozomo.pdf
    • http://skogsformedling.se/bilder_umeny/File/33569418871.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/c32df35pcu76noirtteb51ch19/87474992664.pdf
    • http://syuncyoku.jp/upload/file/79119854345.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f88e8468f---gojogelomesitakele.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d66d5321b7---lipowuvetegufepumexob.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/diren.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608490c33515f---15237920929.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3e99b8280---33199457190.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/fedilafugedisizewiwiz.pdf
    • http://topstec.com/d/files/79597184307.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/86t5cfcqvkqja6hmum5jvdq4ht/15184290159.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=great+h+words
    • 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_off0000e844.bin
dd25585296bc2798d63e0eff1e2216205084071d75640fa21dae9caeb26763f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 16736 bytes
font_01_sfnt_off0001135f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1135F 16792 bytes
font_02_sfnt_off00012b76.bin
759b7fd3fed290f50e24f1aa1e37ff1478a2b093d1d7f66c2ab752a1ddcb349d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B76 10228 bytes