Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4cb77a896c7db0…

MALICIOUS

PDF

90.1 KB Created: 2021-06-28 22:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 641b9f023957c5eee71cf6fbb6212795 SHA-1: 101cdb5fa888dd154d64fd0f841fb46787a017d8 SHA-256: 6c4cb77a896c7db099ad163e988a2c054fb35ba83910909e4daf93c6bf5789c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 to lure users to download further malware or engage in phishing. No scripts were extracted, but the structure and URL findings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/2e6541b03a5c4c2d05bfe267fb6816f4/8727129256.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5f920e025f090a4384d81187ceae3d04/pimabegagojuwanoriwi.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7bf2c429e---97782193314.pdf
    • https://techson-cctv.com/upload/file/tujobijabetizezinum.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d548daaa559---fiwakonikidujori.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/cb89afccd4eba40984c311c8b5505dd7/pufub.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160702c1109d5a---38692983092.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b8688eb977ebd53ea52b76532b1f7aac/389554543.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/aj72j17hn3cpg0ajqj9naldk1b/59368089439.pdf
    • http://954move.com/clients/4890/File/nusenovemikuweruvugetoxi.pdf
    • http://burfel.ru/upfiles/files/suluxodirojomavotoj.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6264968c7---komoxesuzukopakonipab.pdf
    • http://ekotronic.eu/files/file/2245213541.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/d8pqv4fndh4jgcjgce7pktnahp/savafukupeguxefoxipe.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609833b760ee3---mewuxegurexowukevo.pdf
    • https://avvocatoboretti.com/file/5201891229.pdf
    • http://fitviewer.biz/files/file/83638118278.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072632638347---2909939294.pdf
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/eb7b7869a9be9754fad2ccd2cdc456aa/80498283513.pdf
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kapafesigifix.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/rigerovabove.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/400d138094355ef6eca6904d7a4f773a/vafevunefovapawerelutikof.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160734683ea647---97358644474.pdf
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/62668725009.pdf
    • http://homenet-spb.ru/userfiles/file/53362396726.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+kamen+rider+climax+heroes+ppsspp
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee04.bin
9b998f8cbb4b0dd5c339255b9231c42a82533b1b075f5cb826868cbc21075625
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 3252 bytes
font_01_sfnt_off0000fb1d.bin
8236410bc5d863866eef027dcb17bd23499657f7c82e57c3a9aef2f4224426b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 17792 bytes
font_02_sfnt_off0001292a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1292A 16792 bytes
font_03_sfnt_off00014141.bin
d651cf791f4f9bf6b5eb9c107d101e0cfa8d0c7e887c64a25babc172a2649d17
pdf-font-stream PDF embedded font (sfnt) at offset 0x14141 10960 bytes