Malicious PDF — malware analysis report

Static analysis result for SHA-256 4959e1cf60310974…

MALICIOUS

PDF

89.2 KB Created: 2021-08-02 00:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42f37155c613662ed1f3b4cc35cc7c6c SHA-1: 80af5710d8e060c5bd92a20579d647e601374a72 SHA-256: 4959e1cf603109742eaaf3aa99d77ec66369c76358442aea34948124a9f550ee
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, specifically targeting WordPress upload directories. The URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606effea2bc3c---suziwowijuzepojidipada.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609db834e313d---tedukavusi.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/c3m2vrvbf1d3tlsgkih5l12tm3/65302340854.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608da66deaa4b---67695182987.pdf
    • https://kidneystonetreatment.in/userfiles/files/vajanevajuxokekekonevojo.pdf
    • http://antifftech.com/uploadfile/file///2021052921121652.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e06b2b0d58---fopumujaxarisidutiri.pdf
    • http://djapm.com/userfiles/file/217283474.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8db9a20b4d---kafixogewakifamadavut.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d9fa7107---titefopepevasonuni.pdf
    • http://edgecs.net/documents/99338345480.pdf
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/37895060397.pdf
    • http://starrsgazette.com/admin/images/file/38718275399.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a0b7b810e755a1b4e72a2327b756b38f/dumolorilutapifowijitar.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160746eee458f6---lebesos.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/44e957b451ea6acdf1c66671b3608ef3/30279631990.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073cfeae36b1---lobaroxuxesutosidorazuv.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/9oaa3hmk13b87q8de5gkqr73ko/palisonikilu.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c9f62576e---84770567511.pdf
    • http://partnerplus30.ru/images/fornews/files/88520588403.pdf
    • http://accessprecision.com/userfiles/file/piwepemufugafuboro.pdf
    • https://pasarantogel.com/contents//files/xerotipokavi.pdf
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zojan.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+expensive+is+a+gabion+wall
    • 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_off0000f7f7.bin
85ec0b79e2b3a7bb52d138f485c30c3e689edc3876bff6e7368d834d537aa901
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 10616 bytes
font_01_sfnt_off00011023.bin
fab3becb989c8287835b793a160fab929a2278567eebfa7a72b8c70550af1d13
pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 17716 bytes
font_02_sfnt_off00013ef4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF4 16792 bytes