Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c40cfe849d97616…

MALICIOUS

PDF

86.9 KB Created: 2021-06-26 18:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19e2e8cc427f5ee082cd41e24730dd99 SHA-1: b0cfb67b204dee9a11c4832028571a8d53bfe3e9 SHA-256: 4c40cfe849d97616ac7029a29ba67d4ed322dc9167c820757e6c6e05a444b978
164 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress upload directories, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, does not provide specific textual lures, but the overall structure and heuristic firings strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/ad7c0615bc5246de89d31796730443f9/86823137955.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badcdf1014e---migebawazajadutitutir.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/c767cef3a3aaa4b11ce6d74311438baf/kirubijoxejoriki.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/bd9f0a266a37d1f2fb3b18d5f5cc5fc7/16358723921.pdf
    • http://asesorgubernamental.com/images/file/parixuzadu.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/6e7cfa970b17c26d5b2a93006138ef46/54040614716.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/54587f325b7a60c73c4dd69f1b6e820f/wodojelo.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607771be21c27---89254709700.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a77d1b0d69---66216042333.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/dc80a597f729b3ae712b0cd7857b1434/bowiz.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607508d668602---jurutitepawikef.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1b707093f---92490307289.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843f149e97a---tesejopawi.pdf
    • http://ylgems.com/file_media/file_image/file/79408766104.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/a12f6350b7cfa3341c70e60ac6014b32/15145494753.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/ea039a940605207939b7a95df4a4bb5e/wazawosopokevubomaxazud.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ebc068745e28d786fabfb1f833def84e/14092601809.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/cb2e8f6cd3e509c916363e05c29803cf/50527907358.pdf
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/zekuwed.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c45599a2241---bemokunizotexuga.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/2f11222adb1e6306df4a77b75f65aa23/27233923226.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607524d39d037---9073587444.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/sbe491srhp68614qjsuefjj9ep/7867032589.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=united+nations+global+marketplace
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cca9.bin
372459d9ccc285051e0483019ed31c25b24e1fdf9613d57ca9016899706d2cbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA9 11096 bytes
font_01_sfnt_off0000e60c.bin
562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 1860 bytes
font_02_sfnt_off0000eebd.bin
ffc1d8458b25e6b8e7347bdf480ea59142b4e8cb5c9314d2bff8a9cd9cb6571d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 16892 bytes
font_03_sfnt_off00010729.bin
a6ded0aecfbb2ce75a8739a5a60f1a478d4a25106a6dade0b32074efdca9a6be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 18364 bytes
font_04_sfnt_off0001353a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1353A 16792 bytes

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