Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8b517e19161a93…

MALICIOUS

PDF

72.4 KB Created: 2021-09-03 16:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e3ae8d3b9c6b72a2036e5dedb47a3336 SHA-1: 8ac5f0f692b3fb0a58eee374bbd12e432fbba31d SHA-256: bf8b517e19161a93a0f9ace8670dd3ee2ed3a4f41e9a918c6def70d4216240ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=python+oops+concepts+pdf PDF link annotation
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1612e1838adcbb---59066066023.pdfIn PDF document text
    • http://keitbg.com/images/files/70792060995.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a641bf8d580---30071340165.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/73393994850.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/72456948557.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/65048237839.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jm09j5ucrudb5m0ehdtibbr3d1/89870806126.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ae3bf3e87---78478593177.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/tomidusakijuxez.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/xidafusalekabudofe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfb814c2fd---wepafapisidu.pdfIn PDF document text
    • https://geniodelweb.com/file/49389988526.pdfIn PDF document text
    • http://chinazzjx.com/d/files/kasodavegu.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/luwupanur.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210901_4A358EBBE0FDD7E3.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/lefisavomagevezejosomovar.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/51081f3e8336ab919f1179220268a35d/foxalexuvexexidipelumulex.pdfIn PDF document text
    • http://artospace.com/pics/file/45385636318.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dce5edd16c1---28499443057.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/woderi.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/ik6v28dnq78b0h8jcihucrk76d/puzedorasileroxod.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/79578723065.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_off0000bbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD1 10432 bytes
SHA-256: 4166971ec0457567b6340dc8333ad4b066eb00366c2981b4e22b06f4d3fd14b3
font_01_sfnt_off0000d377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB89 15900 bytes
SHA-256: db2c722ff97c3548389b76970374f1172bfbf810cb1b94a156a0124f48c05fb9

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