Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a4834d59b0859b…

MALICIOUS

PDF

71.2 KB Created: 2021-09-16 06:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d65c45032f0eefe0b0c66106851be23 SHA-1: fd9e64cf1d913d1e17edaa4242e0309f22c0a45c SHA-256: 67a4834d59b0859b6009de892d46c3637084c97e4d4998336f1f005525b7a8b0
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 contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to redirect users to potentially malicious sites. The PDF's structure and embedded links are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medvor.ru/uplcv?utm_term=jhimma+marathi+movie+watch+online PDF link annotation
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161312bbb4dacc---15531658132.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/76006608696.pdfIn PDF document text
    • http://airsoft1.ro/files/file/jitukarimaduwidulaziwax.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/nefoxatibumurogof.pdfIn PDF document text
    • https://kawanmto.info/contents/files/60257550726.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210906170943.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358a7779ded---51716895075.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/7711871241.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391e08ebbc6---sotib.pdfIn PDF document text
    • https://hoongnau.com/upload/files/99976850738.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/kudowujurinozujozi.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109041054312196.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1407237260adf9cb3ca698cec89b3399/logusotafigapos.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/80120101819.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/81626483341.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/45018001724.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/nixibikefafokalawekojopo.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a103059afc---34147073724.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/kagipoxeluvimuminititava.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/49752624016.pdfIn PDF document text
    • https://hoongnau.com/upload/files/dufagodule.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/80088460007.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_off0000b305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 10472 bytes
SHA-256: ab97ed715b130093ea88c3e39c2fc0c20cc939617626170607519957c0525f9e
font_02_sfnt_off0000e2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BD 17064 bytes
SHA-256: b6c49a8fe5615fe8895ce86b66be8be2bba9b5cd304e916f969b0320f56b043f