Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6ca7496639db71…

MALICIOUS

PDF

105.7 KB Created: 2021-09-02 12:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 16dd4a4f009047118fb620d3bfafda94 SHA-1: b277b9692cec53c18b6337541b3e9e6f98c30b45 SHA-256: cf6ca7496639db7114c348295f2207809f848b7b95f732b510998a97969ec41a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to lure victims to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://laborke.ru/uplcv?utm_term=tinkerbell+story+pdf+download PDF link annotation
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/gijejunukenu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429060514360029.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/tackqq8vg5vt2mri264ntdprv7/28744351779.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/45822685618.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/7985e2c90998a966f86967b581940900/goxim.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb425e472e---rapoweziforosirabem.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/67558512976.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/49951935083.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/mesev.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072a21cd78ab---53067157376.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/50873987873.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078b2110be0c---55475984184.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/jojipikarejonunavilusite.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084126e86c21---kevaz.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/ruvugodanatitepej.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/refovofiravaniluf.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/j5fgssu00r0psv0b0cch1nta7t/9083337369.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/supajonesoraxagujezama.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/tusej.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abceea157f---sabopoludef.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 24892 bytes
SHA-256: e569925240edd7217cefaddba2f76bde04b325cd8d48667c36d965e4138d4cf0
font_01_sfnt_off0001472e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472E 1964 bytes
SHA-256: cb83427253be486b5dc35224710cea1d2a27078ad6da64da340d8beb93dbb3aa
font_02_sfnt_off00015047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15047 10884 bytes
SHA-256: 3cab86dac4e221a3b339e564ae8b652a4f50382131629e1fd86e07f2ea5b627e
font_03_sfnt_off00016974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00018185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18185 16380 bytes
SHA-256: e62cca045312918b292d130d6dbdb9eee357ae8462ef5226f02e869bf229e283

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