Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d737d13888dd5a…

MALICIOUS

PDF

76.6 KB Created: 2021-09-04 17:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38cd8fab6af9ab056812a486f634513a SHA-1: 7c794d551953cc2b22362e981486c1cd10ea78cd SHA-256: d9d737d13888dd5ad55574d6128f55aae2d2a6280284bc10bdd020bbf0b1d929
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs pointing to potentially compromised CMS uploads. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The presence of numerous external links suggests an attempt to redirect users to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://sevoir.hu/uploads/file/bagikudiwexasisi.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8393ce9abf.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/didigebij.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/zajibewiretupezuj.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610f2820d411f---konevekimekekaxezinazin.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/u4ablqvoemj5s416do5fij7a60/39905736653.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/fivubikesuvepen.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/96208293370.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/85724750625.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/67914313378.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f16abdb48d---gafedomumulonowegubosu.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/49cc38b005d6f26835e04d84e3dfca7c/20516325607.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612055114384a---jizege.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9afbe390ce670c649a3a5ea3b0e14aa7/69059156738.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf66d98ad0c---65056403499.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0044275d2---xosabijekemor.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/8e2dc4e78bca04d7a59141da13fd140f/66576878707.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/jelowanajupopagumorewomep.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/safejerimorones.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b15e7518036---47918677430.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/jeraroditewi.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/zodedexijejonobi.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4536d70671---ginugatur.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16118b3d6cb1dd---14588967608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=numbers+1-20+english+pdfPDF 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_off0000c4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E6 11108 bytes
SHA-256: 6b96e58355b644fd240a04bad848763b26fc79518b5369c154f39e4f9ac11d76
font_01_sfnt_off0000de3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 18348 bytes
SHA-256: 5b2b6824f2fd22dc42961f49f2121035104495fe9f357a578cf7ba14af873d25

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