Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5e58827f0a4837…

MALICIOUS

PDF

98.0 KB Created: 2021-09-01 01:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ebf0693e5244c04720951859c5100a2 SHA-1: e7547104ca487002b29c0f32a4feb9b2caf4814c SHA-256: 6f5e58827f0a48376b32be51c4fac43c025a911f16c36aa1d0499cf8fe68a35e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. Heuristics indicate it functions as a link farm, pointing to multiple compromised CMS upload locations and disposable hosting sites. The presence of numerous external URIs and the nature of the heuristics suggest the document is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://nceed.kr/pds/userfiles/files/dudera.pdf In PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/29405052824.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/39e1aacfde0c2e7d84b421ecbafaa528/29948527696.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123ae06ea77d---binedopumudurezonepawamos.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/oom0gfde88tib9jumba9lbkbl0/guranagewamikufeponikaba.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/8d2f336b8f17bfbab7f7903f85685be0/xuwubitimilesaru.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/077c09b18da9fd7987d3760ebc2a89a0/27858499354.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/kelubamizepojomabitula.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/movekivenopusata.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/84619982509.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/120f10b4b9774a68227c614a04ecc035/firojidaviwi.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/sowogonuxikixobutaselo.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/toxadekipebapiran.pdfIn PDF document text
    • http://megalaserasia.com/upload///fedawakogegirifevixev.pdfIn PDF document text
    • https://fratellifurloni.it/file/laterujaziv.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/df72e6ca2d9bd5a13a771449e687aab3/80838563867.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/xelinupojuzaro.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ec6f3a9b6---jajebanejuj.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/jisojorovofajat.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/78942600748.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/50542512369.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/32000887877.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/ramimaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=benefits+of+drama+in+the+classroomPDF link annotation
    • 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_off00011b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1F 10792 bytes
SHA-256: 56b561770972df213692e257fadff5968a13fa617e5ccee8916df1caa7623832
font_01_sfnt_off000133cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CD 17920 bytes
SHA-256: 09a1705260d8efe70f1bf2fe27ea1f990c891a27a037114c484467f3a5e8785e
font_02_sfnt_off000161dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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