Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb491932b353a094…

MALICIOUS

PDF

76.4 KB Created: 2021-09-07 09:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b7a9c22d396be04604023a3ec135c74a SHA-1: 6458f337f9188a6cd58ec55709bcece64e513c6d SHA-256: eb491932b353a0940c0f4d0ffe17b3210480df62d65e42e9ece22ab70b8d810a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://ketchas.ru/uplcv?utm_term=2016+subaru+crosstrek+factory+service+manual PDF link annotation
    • https://lacaune.hu/userfiles/file/22890888188.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/91619439543.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/28147836172.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/3f5d9149ae1bc33c28bf28703456c6cc/2933863165.pdfIn PDF document text
    • http://0851gay.org/userfiles/202107file/2021071019175670554.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb86f1e41d---42683365324.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d27290c1a6558500b1ae53e7a0c1bf5b/86450029648.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160843ecd8c709---48908313188.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/fodabijapokukapifunozomas.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/woboda.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/munisire.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/80semdingeoce8b5r1ikhpv58d/janabemidub.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/84172543782.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/hqf7v8sls2ii5pt3m4jqeh9ei7/jolututijixo.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/jalutozakipolakizizak.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/47516616777.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/acoupu7lhu77153e8u8jhn95f3/xurekuj.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160736f5b6c3a1---4204731050.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/92884030640.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20218131047152653.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/dakekutulivuser.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/8540423537.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210817004505.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ae9645371---xaraxe.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/bibamemulopum.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d44be02e12bffcec4309e3c1cef8a673/darobifamexatudor.pdfIn PDF document text
    • 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_off0000c4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B0 17028 bytes
SHA-256: 9feabd6629a85d4a90c8e47e0aedb0e2394f1ff209db70274ba303f01b9a578f
font_01_sfnt_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 11372 bytes
SHA-256: b5750aefa6c1f7ababf5fa4bcc0386fbf40a45be6f34dc2930f02f1b584c3e7e
font_02_sfnt_off00010c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1