Malicious PDF — malware analysis report

Static analysis result for SHA-256 da03d35967643d27…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 11:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef423e4fbcb43ef9423e4b36ae949615 SHA-1: dc0816bf92b3625b373e490a3df0d02d4aa7296b SHA-256: da03d35967643d27d2afad0b5f6638e5d87f43687b128fb6d61d3d9a33424ca8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://medvor.ru/uplcv?utm_term=best+calculator+hide+app
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8c4f62cbd---jedojazuxukijowes.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1f75132d5---vozuxomupogepumiwagoniwoz.pdf
    • https://total-sport.pl/img/upload/files/zivugegetibafonaj.pdf
    • http://jewelry-shopping-city.com/uploads/files/202109051247351930.pdf
    • http://impactpluslearning.com/ckfinder/userfiles/files/40138121412.pdf
    • https://inks.bg/userfiles/file/83703920580.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16131a25989764---disuzufowibofelulanutu.pdf
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/78248958830.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340d90a7930---difedaxewufitixesalap.pdf
    • http://stickerbarcode.com/file_media/file_image/file/12091676739.pdf
    • http://himalayakebab.com/shipinc/userfiles/files/13511886662.pdf
    • http://myhomeinparis.com/userfiles/files/56610076088.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/keradov.pdf
    • http://levant-tekstil.com/other_files/File/85619078644.pdf
    • https://mccartha-cobb.com/userfiles/files/63022450092.pdf
    • http://rvhifi.cz/files/file/26064470722.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161417a50370cf---19190017184.pdf
    • https://vientangluc.com/upload/files/97144363355.pdf
    • http://dansungsala.com/uploads/files/91387610802.pdf
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57754168958.pdf
    • http://fitviewer.com/files/file/50097410969.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613578357ee67---jixivenurenapef.pdf
    • http://perfecturology.cafe24.com/upload/editor/imagefile/degabotewedafizibubob.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d05e.bin
9ab5eb399b58ff10505482f2bbf1aa8e60f65a558545a097f8f3a14ce572ed75
pdf-font-stream PDF embedded font (sfnt) at offset 0xD05E 17296 bytes
font_01_sfnt_off0000fd3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3D 16792 bytes
font_02_sfnt_off00011554.bin
c50e88ee48a9abce7d7132b9597936e43f9cf68a7f8feb4c8d020404e75b277d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 10660 bytes