Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8b05e4d6ddb5dc…

MALICIOUS

PDF

74.6 KB Created: 2021-09-08 03:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 23111330e70618065a4e372ea5f608f6 SHA-1: 78fc460c32c929aa4ccc019b2f1a4ad11fe23ed0 SHA-256: fd8b05e4d6ddb5dca11a4a196270c5aadb729348f999f82b1031e1ddbe6a23ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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=parallel+computer+architecture+and+programming+pdf PDF link annotation
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/zegovika.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/87708264509.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/bejafutadogoduvijudox.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pawepowon.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/edc0af3230507dd18a3e31e022629127/merukudasebifin.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/38e8a4328da84f8e4f303a5cd6b38520/bakufu.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/85298086467.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ed168353752dd8eee936686c29b3b836/61918421813.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f78160687---93295308471.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ead2e43156---wagitivakexijoletenuk.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160afffc0e1b55---18838872147.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/52957305195.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/147bc8b358d03bbbd5c0c9f6e9189760/12078250743.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/18825822435.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/quufhlm9emqaku59v6a2lftmi3/refenudimixaj.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d4763a034ec9faba957c753fa7ea98dc/4675858410.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e3d99f6bd9dcfd918dbc238fe10ce7a1/86482222243.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/96654663164.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/radutigasobofitu.pdfIn PDF document text
    • https://tdfstore.it/file/pujepawujuwufifojazik.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/nt9bnc1c32cjpgv36gnfiae0a2/37280012530.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_off0000bf37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF37 11000 bytes
SHA-256: e3b02f27fb32d83080ddb03e4568055da80feb9706cde30bd6db2c170ec1b837
font_01_sfnt_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 17152 bytes
SHA-256: a0e2a3c618514cb479d0aa6192ff479a09c7affc5105343583d19112bda20c8f
font_02_sfnt_off000104da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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