Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa616ef4fb46a7c…

MALICIOUS

PDF

87.7 KB Created: 2021-07-13 23:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93a13dac2f6a72e21cf96bd93a47ab90 SHA-1: 0523e986550bc4b97ee14363af0a4a90fba16b77 SHA-256: 1fa616ef4fb46a7ce84cc88477dd65f47656a864bc7fdf8d5a687045c68274e1
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly indicate a link farm designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/15d0391a1dcdcc09c4631e07ab022baa/99459339042.pdf
    • http://www.kotolantopeni.cz/files/86575717158.pdf
    • http://hurtmar.pl/Upload/file/83278404258.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/cf27ad9c6316077ed04f19adfef1f36e/fivojimavomakofi.pdf
    • http://bioident.pl/photos_fck/file/96120659292.pdf
    • http://alexlunacoach.com/img/editor/file/86737851310.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f44975b04---jubemusaxigavadiwen.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d388da3a3---4353927690.pdf
    • https://accuratesearch.com/userfiles/file/jukijidezeviwijutudin.pdf
    • http://web68s.com/upload/files/pugarunote.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b590c8d55fd---wokutumenofojipe.pdf
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210705_EAB2D714A1F42A36.pdf
    • http://winhazel.com/indigo/ckfinder/userfiles/files/subalexuritatefuxojobeki.pdf
    • http://watthaistuttgart.de/userfiles/file/baterobu.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac3b23f4f4---vatufemoguronusake.pdf
    • http://biogenetec.tw/image/files/20210703_131635.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f03b5f878---89137916135.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48a3de698---xadadajesisakifuranusofek.pdf
    • http://thaoduocvn.com/userfiles/image/file/lojowulobineb.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dd7a3334f---76087949141.pdf
    • http://connect-senior.ch/uploades/userfiles/file/gelano.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/4a24930c47728516492cd067c01d13d3/ligube.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+are+the+most+reactive+nonmetals+on+the+periodic+table
    • 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_off0000f476.bin
c4f2cdc9e116c5226a2492db178438b2b05fcaccc2e516eaf49bf564a7108ec0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 10976 bytes
font_01_sfnt_off00010d8f.bin
8affc8910680706c9f0ca06a36fda8db50585c2af783af57c00848f23eea4d4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 16676 bytes
font_02_sfnt_off000138f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138F9 16792 bytes