Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3241ad4bf75bbc…

MALICIOUS

PDF

70.1 KB Created: 2021-09-09 00:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 70f0b9c8065dab8beb80674be290c707 SHA-1: 84c458b91fc96e25528125b786645ca04f40745b SHA-256: 5f3241ad4bf75bbcbdba6afc384a62999c4cb0c7142c53edbd59fd250052fdd7
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the PDF is designed to funnel users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://westpakusa.com/phpsites/vertical_living/uploads/file/21661788746.pdf In PDF document text
    • http://cochemical.com/upload/files/fozojipaloxowenujoduzesa.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/48628519094.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/67437592552.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109041722511870.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/bukevunebumakabi.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/6511388874.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f77d3242a1---60811636161.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/82390582162.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/wiriwunopezu.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/583a3b5e5b1b963ae3e35e8f645a132c/morel.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613528d07a3ba---49930452850.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/sewit.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/90156436862.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/22219893386.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/xewugijitefuranobanakufiw.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/8946323032.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/15769963746.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/makopafibaselux.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/67644960355.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/2463288281.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/90777549475.pdfIn PDF document text
    • http://unsersohn.ch/images/file/97494687335.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210907054716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=gfx+tool+fortnite+mobilePDF 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_off0000b2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADE 16056 bytes
SHA-256: a96fbe3ee750b8ebcbfcabd5007b4a7cc5760d6c1d6c8fbafe89eb6ac0044a2c
font_02_sfnt_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 10328 bytes
SHA-256: ab193b9adf8ff543e305ae7b9542e689e32b54bd40becc6fb2733690eb7a80d6