Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdff1d239f900ad5…

MALICIOUS

PDF

87.5 KB Created: 2021-07-07 07:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6d652b6bcd8b7dc6fdf4a12a633eb8a3 SHA-1: 4252040d522aee0bf6a5e678a5d6ecfc9c8d6032 SHA-256: bdff1d239f900ad55ed6c608b0f0ad287d5faadae90cc7de42646580dc283548
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on various websites, many of which appear to be compromised or disposable. The document body is heavily obfuscated and does not provide clear textual content, but the heuristic firings strongly indicate a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/8lq4eqnnung63umeoki1j9chkm/93249184539.pdf In PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/tonavasuxawug.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/soxexozinixenoweke.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210608235240_xx1jgc.pdfIn PDF document text
    • http://flexa.cz/docs/file/47661995400.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/43004839358.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/vegidiw.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/3e085c1980bd5e2b2695bb194f47bca2/pedopugezurejojadixuli.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/pafazopozutitewafez.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/22726227979.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e188680a914---lenamuworizifixatabulokag.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d43f148259---85952249034.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/3036916076.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/8124352886.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/vodasuko.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c142c9dc2---ranin.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/pojiwavamiwumive.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c216b3e8c3b---29606414437.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/koxinavawasat.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/nq19u86vqi08a0lpdpchlk1cgm/mezovigiguworofedilapepup.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096ed19c5462---tudorikibe.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/95536202485.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/8933380e17ac374ee89a3bb834b598c4/fedawikiguwatojata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=young+justice+artemis+and+willPDF 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_off0000f134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF134 17060 bytes
SHA-256: 2b477f81e5b2ec7b8b04af04d1161705f6e29339c8637f6785167f68a00c53a6
font_01_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BB 11012 bytes
SHA-256: 81b455be17c774104267c0316deadef36d9078881dfc140001bee3485f3c9887

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