Malicious PDF — malware analysis report

Static analysis result for SHA-256 325163c1393edd4d…

MALICIOUS

PDF

73.4 KB Created: 2021-09-08 03:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39bedab762cbaf1c77849e0ef157e95c SHA-1: 871da396eb3e1201880b02fb10f6122112c49c46 SHA-256: 325163c1393edd4db9f8e9b98adeadb1d9e7d1d5a6de0ebbb1d7b9c1377190f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs that point to link farms hosted on compromised WordPress sites. These link farms are designed to redirect users through various domains, likely as part of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/56734654ec93b62eec28667d0b1a04ed/27455921770.pdf In PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f3262d71b---74783041836.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/mozejojifokir.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712415c8b56---sugaluwagareka.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/66637415483.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109011803263306.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/38414129889.pdfIn PDF document text
    • http://tele-video.ru/upload/files/93963716666.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/pawofirabez.pdfIn PDF document text
    • http://capital96.com/userfiles/file/11650231396.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/08ff47f77886a419813e673ebddeda23/nabow.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/16119659061.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/famvcb3ng55esfqu74nuu5r6d3/fuwivitujabadimazoxole.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/72632159135.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/timanusolalobemebu.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/8c7de219e0f241bc165796baaf0ce74a/jovewifefe.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bda43b54cd---vigiwumipowiguvazekeki.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/43336951622.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d3eaabb68---woxenof.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/gegapedibarupixuvizel.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1a42ce6bc---12951365580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cara+menghitung+uji+normalitas+data+secara+manualPDF 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_off0000be2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2E 15764 bytes
SHA-256: c582f964f2aaf8b22522d48cf467bfb1e42170a07ce42c125b8c5ec2d6db36e7
font_01_sfnt_off0000e6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 11076 bytes
SHA-256: 08cbc08ac2e4bdd4cafcdfb7c3772b4a611c96f86fcea470dcecbad4dd1f732c

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