Malicious PDF — malware analysis report

Static analysis result for SHA-256 38df5451f2bef880…

MALICIOUS

PDF

70.8 KB Created: 2021-09-07 11:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: acd7d186f24fafbf4b824d8d9e259c3d SHA-1: 0857a9b6d4ccf5a73210bf6dfc68997965aa8b18 SHA-256: 38df5451f2bef8809b4010511ecf793eac7e144f855f5f98aa597888935568b1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads. This suggests an attempt to lure users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.mustwalge.ee/data/content/files/61703346020.pdf In PDF document text
    • http://guchenes.com/d/files/punemogegumajibasabipiz.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087b283dc212---41798944488.pdfIn PDF document text
    • http://machulski.com/public/file/fofetugotuget.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/28075150967.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/1uaer0gb470hrtsrdua6na1tv1/22619933528.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/91116877428.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4575d7ccd2---dufifog.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com//ckfinder/userfiles/files/telonuredojitasagagimufev.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/pamebusupekenunoxasasedo.pdfIn PDF document text
    • http://cocoal.com/uploads/file/lazijogagesilekid.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9c0a50bea---nesaj.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/24456812831.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/56558681636.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/e85efdf05aed84b4f0007031059881f9/wezudefazepuwilazidup.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/mlojbqd3agb40opvhmr0tdhl66/21839176864.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078fa5f19760---22755590302.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/89176156607.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/xebuduwajujonof.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/d7mb7dvkensapmqua8me57jt93/dobufesajofetanu.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/95985712253.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b796b59cfee---49493230163.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/sezipusakija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=canon+canoscan+lide+400+user+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43C 15832 bytes
SHA-256: 9d087e3dacfac168be306651cb2080b12193c41b25ce628542f021a4228410ff
font_01_sfnt_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 10764 bytes
SHA-256: cc2947561ef6266bc6bf0ccd6a40c0b60241070580866f7158dc7aabdafab275
font_02_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1