Malicious PDF — malware analysis report

Static analysis result for SHA-256 57cc519961c583a9…

MALICIOUS

PDF

88.5 KB Created: 2021-07-10 12:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bcef8f16ed437fe691cfceb9935f6e0 SHA-1: f26641a32645eda40859c070786f11d5ada9f513 SHA-256: 57cc519961c583a99ece96908d7f8bd2cc9da7a661e7eb1ede93d59cfa7bb0c5
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests an attempt to leverage SEO or disguise malicious links within seemingly legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://isleo.com/i_photos/file/segajosudixujubewudemepo.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a698ff63---83916599646.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/1al0ds6r130malefbrq6vse595/35269821923.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc0d6a506a---xowijaji.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2febe7219dd30d8be9ac431528458826/36064967442.pdf
    • http://driscollandgibson.com/images/edit_images/file/mupoveziwugoxi.pdf
    • https://mt-creativestudio.com/ckfinder/userfiles/files/80022767496.pdf
    • http://re-view.online/fckFiles/file/kowukokase.pdf
    • https://saporidelletnastore.it/file/12981000563.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/473da905df3755da9bcd1cace08f513a/98060723748.pdf
    • https://nicosiacaffe.it/file/79112052397.pdf
    • https://ludifrance.fr/userfiles/file/jukujuxevolatimitedawob.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f5b80afc6---zumuzediparunizuxe.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/aaec7o70ic5fcmt9iptcb2rcrr/guvefi.pdf
    • https://epgeptech.hu/ckfinder/userfiles/files/81378681755.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/96983341115.pdf
    • http://satakantaresort.com/user_img/files/79986080799.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ce7861c2d---64838637425.pdf
    • http://kopdesign.nl/userfiles/file/doragowaz.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a55d0c5846---jevupilukukajafigonibekaz.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/2iisuhs9fh08qcvc1m3gb55mr5/42098718568.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/312f07b8427661d3f2fc561ee671a9e9/pijakojademozizis.pdf
    • http://baobianhkhang.com/upload/files/xemilufalewuwumapogorego.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160780d186b65a---telewetodekijojesavobo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=phytolacca+medicine+uses
    • 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_off0000f3bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 16792 bytes
font_01_sfnt_off00010bd2.bin
643e7efee5ed58131026f6c8fe50b26e7f8848b1e0b3ffa88a548fa03a8d4d90
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 10748 bytes
font_02_sfnt_off0001245f.bin
e17f2e1f68c96491aab84c9bf40e050e17efe8c08c9c88fcd5686b7456487b8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1245F 18632 bytes