Malicious PDF — malware analysis report

Static analysis result for SHA-256 98570ec9536d1f05…

MALICIOUS

PDF

77.8 KB Created: 2021-08-14 19:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34d39c1705344c640fbdcf6ad721937d SHA-1: 81f1908e53b2c8876ab9dc0d54ffc06ca6f39676 SHA-256: 98570ec9536d1f05d6ce348df0b0adf4882dc90d189a74044d1fb423c2d11901
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. It functions as a link farm, containing numerous URLs pointing to potentially compromised or malicious websites, including one hosted on a compromised CMS upload storage. The primary goal appears to be directing users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://fullhousetourism.com/UploadFiles/file/20210806235439172.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608565fb48aec---gufurijaximoxemazutiseki.pdf
    • http://bilmatbasim.com/userfiles/file/wubefimotiworizunure.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea4d99f898---49759727818.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2268a268db---64333789386.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/f70l5jj4eiifvc4uv02t06qrvd/9960409872.pdf
    • http://k-souz.com/userfiles/file/27121534957.pdf
    • https://cordovajewelry.com/images/file/61973461089.pdf
    • http://infoegrafica.com/userfiles/files/dazuwasut.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/398249371d8392beaa14922f017e70cc/27102457239.pdf
    • http://bouwbedrijfansing.nl/userfiles/file/wakoxetarazujizemugel.pdf
    • http://lighthouseofworship.com/clients/44803/File/64737148739.pdf
    • http://vom-ragnaroek.de/uploads/file/pebitudenejeni.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/41d6f8285bb19dbb6365f1cca734058f/zisamonufekadi.pdf
    • https://aravlicraft.com/cmsCart//upload/file/16874719510.pdf
    • https://samsungvrvklima.com/upload/ckfinder/files/zafetoz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=multiplication+table+worksheet+grade+7
    • 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_off0000cded.bin
e6049f15168050a290505ef8cda99f5d1edac32ebfa463be1f71aa22f0c629af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDED 16280 bytes
font_01_sfnt_off0000f825.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 16792 bytes
font_02_sfnt_off0001103c.bin
c3e27d0c9f3ba4fd6a6629a6df18566bc8d332b2f832120b3e32350dedfb54d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1103C 11256 bytes

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