Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d28ed2c08ce83f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 10:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: af664e5cd79b5c6068d2789242c30e24 SHA-1: 4ffb7fdd26fd1d683b70e2ea2b3ef3f528608abc SHA-256: 79d28ed2c08ce83f3cf3427050cfce512cdc7e6280d48827ad70bfb603d01284
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. Heuristics indicate a high likelihood of malicious intent, with ClamAV detecting it as a phishing trojan. The primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jjcfurnituremaker.com/userfiles/files/19506050646.pdf In PDF document text
    • https://acgroupenterprise.com/userfiles/file/gigiletunolununefezifiz.pdfIn PDF document text
    • https://noddy.nu/images/file/dalekowugugopibez.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/5104904101.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/98227267884.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d44be02e12bffcec4309e3c1cef8a673/darobifamexatudor.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/nawiweneba.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/ludefejafutenuniniwal.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/natcdc7ilftbi216egr5q84iol/21078583050.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a33e7154c---semitejivamod.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/76137141993.pdfIn PDF document text
    • http://195exim.com/datas/files/fezofabotapubab.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/27201343216.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/54039479985.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/98037948699.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/soraz.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccec6583806---korinixanuzuzepo.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcaf7a7cb3---10123929544.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083fce841b14---solosenuwapakerofad.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/zigididinudagemikukuxupij.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/xaviruwojalonew.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/foremopifix.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/55999875913.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/butodunulenefomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=normal+creatinine+levels+for+womenPDF 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_off0000d598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 10624 bytes
SHA-256: 69fa72ee23cc85caf3165533bec98f19bcf33eaf22c4d479c8b3cf7cc1680b31
font_02_sfnt_off0001060b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060B 17136 bytes
SHA-256: c593316e369365b6fa7cce954de0b66668982158cb86955189d29034605d23d4

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