Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f650f2c4ebe7af6…

MALICIOUS

PDF

80.4 KB Created: 2021-09-23 19:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f178eb7e686c7e1fada7426675ee1b7c SHA-1: e050adb24e03788a1939e0c2ec7604e1921c6ac9 SHA-256: 8f650f2c4ebe7af6b11e72d844e0caced62e3ceb17295ab017f734a0e75e40e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of multiple external URIs and link farm heuristics indicates a clear intent to redirect users to malicious content.

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://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393af92944c---73451009580.pdf In PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/4509755076.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/vonijusodemoxeze.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/zijakabexujozed.pdfIn PDF document text
    • http://taxfreepoint.com/file/wetejoxedaziwemase.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/dakifubuzaze.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/46792162017.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/punefuvizoniniwibak.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/47209709270.pdfIn PDF document text
    • http://cosyromania.com/media/file/78229909731.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/guwerinezefetamomoki.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16145987ee5819---44320541730.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/79245279504.pdfIn PDF document text
    • http://stylekd.ru/files/95092858651.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/wadorepit.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/58582184358.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/kizofonojikufebi.pdfIn PDF document text
    • http://kodemari.info/data/files/demavapumojofakol.pdfIn PDF document text
    • http://briztravel.com/upload/files/foxetasejiwefa.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ada047843---divifowelajutifuwe.pdfIn PDF document text
    • https://podimercrm.com/img/files/36669689532.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210919172227.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/repunonizirobebexim.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/nisorodamomowek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=background+data+usage+androidPDF 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_off0000d4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B9 17448 bytes
SHA-256: c9d3faf4d23b11ab3d44711f0630df28267288c923bfe7496183d2a5d4354919
font_01_sfnt_off000102eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EB 10744 bytes
SHA-256: 55e6491ace2568b65e4a39f1a0786869f541bccf76aafd55ee948b3c712e9133
font_02_sfnt_off00011ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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