Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0d7641e95d1d8d…

MALICIOUS

PDF

78.7 KB Created: 2021-09-10 11:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35a60bad29f164f1e88e5ba573929e7e SHA-1: cab8251ef6bd70a0a28400257e395d6bc29e9840 SHA-256: 5f0d7641e95d1d8dcd07cd98509073650990517748db9f5f0560163076701dde
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. Heuristics indicate these links are intended to lead users to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=download+tap+tap+app+apk PDF link annotation
    • http://jingyitech.com/uploadfile/80846482612.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/11820895445.pdfIn PDF document text
    • https://seerupit.dk/assens/file/dasaredeworos.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/749a577bb67a27edc79ae1f3963786aa/18730908941.pdfIn PDF document text
    • http://citty.org/images/uploads/file/83220206117.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/dewawa.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/finapazuvosofepanekifon.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/13000124302.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/83020315332.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/nekodo.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/78983682444.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/noxonuvukopixusivezude.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/79200656815.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210904235342.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/siwamefiwanajuguj.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/zagoj.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/18140664533.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/57531652495.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/60616741460.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f71ffb86a4---29429525705.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/54424265893.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/70890731088.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a7fc34478ddfb3c37ded5fb19681fc20/81889967859.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134df3e05b20---46775335260.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_off0000d2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E9 10072 bytes
SHA-256: f2cd35a7f23fddc8c57e892e4d872575bddbe77c6a43fda802c55eafc4b6e96c
font_01_sfnt_off0000e97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001018f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018F 17084 bytes
SHA-256: c7a59491f43a810e55d55a69acef0c5d386de349d043657150e832dbf6d0795d

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