Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c7c150f5c41782…

MALICIOUS

PDF

91.4 KB Created: 2021-09-21 10:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8748672e771d97a807dce33d97128371 SHA-1: 828389a9291e5fd32bd63765cb0b1a17934aeb41 SHA-256: 78c7c150f5c41782d1fa702ae36c507fb5c113ae9bccfa83f60a528965c1c579
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://pixomot.ru/uplcv?utm_term=darkness+and+flame+4+full+apk PDF link annotation
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ef234f1dc096969b46c703245d0088e9/65602935813.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/xekalipaduzovomuku.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/kamajinazaluzav.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/nakitawigepeko.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613289b3922a2---radorufu.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/27277294344.pdfIn PDF document text
    • http://vswet.ru/f/paxemifavumes.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/4623865712.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/suwagimiguronukux.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/votibo.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/lofuzovawij.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/68892667610.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/55087614696.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/sitededosilerirobeni.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161483edc59a5f---bunefaseja.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ab6f739ec---limopagurerosaselixigozen.pdfIn PDF document text
    • http://safetruck.gr/images/file/megamigezasef.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/254j04nbbtv2np10gj32cu8oc2/dofixuletilezonikuvebep.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/jizetulukobigiwomuxaju.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/nowiluvedudipikaxinefeso.pdfIn PDF document text
    • https://windsbs.biz/files/file/95603635046.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/21631515464.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/sajemijawugisilenakudozo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0c50d11e5---85425301352.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 22664 bytes
SHA-256: b1f20b38537f43037afb4470251743d61f4cc001b841e01739fa77dd15f7b80a
font_01_sfnt_off00011a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A16 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_02_sfnt_off00012fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000147bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BC 10620 bytes
SHA-256: 7d0cdf38e4a43e79156af16bfe8e70b13329a7f5c21b59ea0545a9fd41f746c9

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