Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c0ffdd7120f646…

MALICIOUS

PDF

88.3 KB Created: 2021-09-18 16:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 69bd4e959f34a7d1d3e66dd4449a0584 SHA-1: 59f319018c501b9cf77a0c71529106ac48b3572b SHA-256: f9c0ffdd7120f646077f6bd4fdc0927c6af44be81a6c7c4fe70d34557b0eb23b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://www.gobarging.com/uploads/textareas/file/biporawidod.pdf In PDF document text
    • http://eska-lift.ru/userfiles/file/wuwaxogasupaxona.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/tapuku.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/kojabukefesojotuzuxenorib.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/lotukewurubovamudaselasi.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/nuvivoluvifutofa.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/85893496510.pdfIn PDF document text
    • http://ktcz.eu/files/files/jitemexinenebowuv.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141042a69059---8004984460.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210911182251.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/63510540609.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/97239689370.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/balumitudata.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109081734493265.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/39912855873.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/jurilobozawozose.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/xokakulusaxum.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130123643bc7---linivunufatifaxoletoru.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/69586889948.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f06200490---lajasudofedisexetanukipi.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/20594456940.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/90477577592.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210901_2D19230EBD08DBB9.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/miwibetoja.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631934056.pdfIn PDF document text
    • http://zubrcup.by/files/files/kepulafumitafimetixej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=motocross+live+stream+freePDF 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_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 10452 bytes
SHA-256: ca36f1da6c1ee91e82dd7248881ec65b8a3c0eeb6c812169cb63d54f2fab1cfa
font_01_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 19380 bytes
SHA-256: dbaa3284dc5d2fa85f3793ca4da4ed6411bf3d70289affac4166d63d16c9c06b
font_02_sfnt_off00013af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1