Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6bc651008f31295…

MALICIOUS

PDF

71.4 KB Created: 2021-10-03 02:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 05413b91ce0561213559f13d9da2cd29 SHA-1: 29b5d8977b7cc1ced9a2a1c2ffa8415291ffb745 SHA-256: f6bc651008f31295fc750ced4a996e291af4c73aafdde10a925705f8f832ebdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, redirecting users to various external URLs, some of which are hosted on compromised CMS uploads or disposable hosting. The presence of embedded URLs and the PDF structure suggest an attempt to lure users to malicious sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pistant.ru/uplcv?utm_term=3+letter+word+from+bound PDF link annotation
    • https://ipmgrouphr.com/uploads/news_file/34861356188.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/lopugipukepapikuzo.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613825b0233fb---52620037079.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/70549361598.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/bce6fd735cbd3c09ae7870f4bbfe2899/96877060469.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/pumalivizemegejapefebure.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/zavif.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/bifonodafaluwiwovora.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/75641539403.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/47426281092.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/0ca023c876f92d4b02794fbf998773f3/bawujivekuwuzajobir.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/sapiwimimo.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/xapizufizivexi.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/wisufafetudiba.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/loxuk.pdfIn PDF document text
    • http://winso.tw/userfiles/file/darovoraramewe.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16151f6ff991f7---99993024434.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/20195181670.pdfIn PDF document text
    • http://yuha.be/_files/file/95870538100.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/nizonixopafatasexirumoso.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/sakumamojiwakidatenir.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20211001180213.pdfIn PDF document text
    • http://anpharma.net/upload/files/nojuluxagomiwomurufejaw.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d489331c0---21577536389.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/18618407456.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_off0000b5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A0 16516 bytes
SHA-256: 66266a8ac0a23dbc9b2cc2f0d8e54af93e75735a7801600c68ee9987c475d206
font_01_sfnt_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 10492 bytes
SHA-256: ef8c7df39eef67567fa4108882116dc12d31629ab105301e85ca679a7fbf628b

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