Malicious PDF — malware analysis report

Static analysis result for SHA-256 36227db1fa11807d…

MALICIOUS

PDF

63.7 KB Created: 2021-06-21 17:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6d3ef8ea3be01ad08c04be16ad9458d0 SHA-1: 8d8bd823be31e0d463584f35dbe507c801550dec SHA-256: 36227db1fa11807d0e5966c4b1ade5660e9854be9ab8831952426e457569aa8e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The PDF itself contains garbled text, indicating it is not intended for human consumption but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e142a154ff---42326287004.pdf In PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e6f392c1c---kimorojeviwe.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/6uob73kcbcf828ihacskl7ohta/dijodofiroxufozaj.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/zatigejopozuri.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/268540134b647df7be5d4f16db75230e/taxexuvezosisa.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/jafaxolerotarawatisexa.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/31331688789.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/860ebae290e12f24cfdc1e5e50a1e330/zedanelanimabunowojoj.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/kogapirerulasale.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-25/20210525205301843475.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb70133d51c---77845380336.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210513/file/16209136396292.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/13745946235.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0de8e40cb4c621fba509b7f68c3cecde/13683285940.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bce73ad962---rizefaf.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/kesenizofusogipetup.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ada965c8c9b---68721328840.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/78546538820.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/75582324638.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=maha+mrityunjaya+by+shankar+sahneyPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD26 5280 bytes
SHA-256: 1152c64a2f0883131abec9934cc507d337b09a3fed5e87bc1786f26b5f0ad306
font_01_sfnt_off0000ceff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFF 10064 bytes
SHA-256: 858ef8c0dededf05ae8e90ed9525c6139a9ede3f1da3ce3d78b5835fac16e042