Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdaea559f2e6499…

MALICIOUS

PDF

82.7 KB Created: 2021-08-19 14:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 286e7600c80f100d4e131ab27aed4a60 SHA-1: f1b126f70ec8cca77c31eec762441c72ea0c9dac SHA-256: 7fdaea559f2e6499391a20781948dc3beb4bdcc2252793a4b017278c59c6979f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and does not provide direct user-facing content, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ad67c6a20---75466575345.pdf
    • http://automsystem.com/UploadFile/file/20210628102408756.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080a5517b74d---1503477688.pdf
    • http://bafiti.com/sklep/userfiles/file/lunobofokim.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/1cfd6faf6d5a979d9f530eb3dbca656c/wifurimoxegevosepeliroriv.pdf
    • http://malbreil.com/userfiles/file/natelevagewatatadu.pdf
    • https://stijsr.com/userfiles/file/nagoka.pdf
    • http://scandirent-new.ru/uploads/assets/file/tanuneparuxikevodebafi.pdf
    • https://havanic.com/cache/fck_files/file/tiwirebegexujazugur.pdf
    • http://spadhotel.com/basefile/spadhotelcom/files/71320904705.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ef3325d6---vabuwanovujiwiverixemi.pdf
    • http://isagenixmakessense.com/ckfinder/userfiles/files/63169763140.pdf
    • http://hotelgiottotorino.com/userfiles/files/monawofupuvinoxafu.pdf
    • http://tunesistudio.eu/userfiles/files/52547924618.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/sja76bllivg065p97ovisol07v/vonunikili.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070f60f9a2e8---46275674351.pdf
    • http://asbufestival.com/uploads/FCK_files/file/nusuzupesimixuri.pdf
    • https://muachungbaohiem.com/uploads/userfiles/file/40946859562.pdf
    • https://milliondollardesiclub.com/upload_files/featured/files/42421529494.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b298a4412c---35691146482.pdf
    • http://interno-kazan.ru/upload/files/pewozorizom.pdf
    • https://stijsr.com/userfiles/file/xupisevatumubozegizopokuj.pdf
    • http://jncs.kr/page_data/file/20210718161945.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/xadofe.pdf
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/gefefid.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acbf9d85650---bamuniwalelonu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=fiction+novels+by+indian+authors+free+download+pdf
    • 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_off0000df1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 16792 bytes
font_01_sfnt_off0000f731.bin
8c0753a5c8476572c29b99d126afffb776bc0ac63fbea143f6b53a19eaa9455c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF731 11200 bytes
font_02_sfnt_off00011138.bin
0c2b5d55fb42bac3fe7e748a3ea2c54975cca466c26140941f3898e2949f7519
pdf-font-stream PDF embedded font (sfnt) at offset 0x11138 16732 bytes