Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bd96be677167c6…

MALICIOUS

PDF

85.8 KB Created: 2021-07-13 20:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6539c163ec91b4fdb6bb3a73732d66bd SHA-1: 105abd363fb9e4cbb6893989f35d26b48974d985 SHA-256: a3bd96be677167c64d93c2b711fb7bb4db6b6165b4baecf43667991c59a562cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://pistant.ru/uplcv?utm_term=chatrapati+song+downloading PDF link annotation
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d497ae98f---bokulenaxuf.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160dcea3ae954f---majazakud.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/13ff13a4157f1abc6bb27f02c1c3215a/nalukopusaluwidagexisiro.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/82067042620.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/p872nmeti7hm0ooc23i19hecg7/jolid.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/gibera.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/jibukites.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/2298389653.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/nowetaletuvo.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1eaeac397406ca792048494587e07b34/5258901943.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa728f6e9---89828818745.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/nozilodixexos.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/c5487cc10fc731bfa674de94056609ea/767635007.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/27ea495d71b680882eb3cbdbd932dc21/sigufuvonefo.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/modus.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/25deb868f809c33e7cb770f4a56d2396/87957462079.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/90046794603.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/pajena.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/3aeadf8e3d58db4781101ca6eb765995/68233212223.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/kexogenuworifu.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5ebd707b075fc7a7facbb7cfde3502ff/3997119459.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/84588507003.pdfIn PDF document text
    • http://biosite.ru/images/news/file/33596631497.pdfIn PDF document text
    • https://rcot.org/userfiles/file/sanefemoniruxi.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/xuwevubesaka.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/lfubnej8ogflk7n7bnqvc7huva/xutividuselasozepofu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B3 10656 bytes
SHA-256: 90048bf252354abbceb2306ca9170d07a0ec9abdd5f8448e23cb1d54d83b5f95
font_02_sfnt_off00011de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE6 16808 bytes
SHA-256: 364722ce17b4c253f72e6fdc2772a599121764859956834ebe81659cd1cd0c9d