Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8dda0d8bfcb4e7…

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 17:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad8e520e08731723ccb6c66e61e9a9ed SHA-1: 3e2e5ff8444b959aedc68f8c15072bfcdb67fd45 SHA-256: df8dda0d8bfcb4e71bcdb998108c38138a2bfbff8db19714a9f5b2733d14cac9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of 'utm_term=fake+credit+card+for+payment' in one URL strongly indicates a phishing lure related to financial information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://yocarbroker.com/upload/ckfinder/files/31072928672.pdf In PDF document text
    • https://facades-et-traditions.com/actualites/file/bixakizosakamoledu.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c0641eab8---juzokuvesaful.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/1768594c38c920c5a4243ff62c74f82f/kugibaluxobujezaxafa.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/dewijubuwibibalafolifob.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/93796702643.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/ratosokepomi.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210925160704_fgtv6f.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/zifap.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/zilaferakidegowuti.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/jitodololudebar.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/441745638.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca7d9e22ad---88511423858.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/fisukudodug.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/40511595448.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/94341461532.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/nivamavez.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/98155997788.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/45953462297.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/bebezadel.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/80048283457.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/mnoe4lq06m5l9kl7f25pduilbu/50456326049.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/23592329537.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-17/20210917192317168397.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/ravuwizu.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/12026898282.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/pexanoditipawituge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=fake+credit+card+for+paymentPDF 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_off0000b47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC91 17172 bytes
SHA-256: e319366fc0e62a360ce0983c4613042fbc3d21b68fd407fa435a15c29a9de62d
font_02_sfnt_off0000f90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 10748 bytes
SHA-256: 95a056ca0194051184afb882f0dd443190f4ff5c9480fb0b09fb5e47dd040341