Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e8f5c2f81fbc8c…

MALICIOUS

PDF

85.6 KB Created: 2021-07-08 09:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fb9746b64082038ae5d25e582ce25c37 SHA-1: b1208a7120e1ac46fa7695f63596875580987fe2 SHA-256: 84e8f5c2f81fbc8c6f6b4bdaca1f98806602cffbe2556402112d1d546939df3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while some are marked benign, are part of a larger network of links designed to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.sport-konyv.hu/userfiles/file/zozaguwanadukol.pdf In PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/776d4bfce0320e9cc477d90da17f0b67/72426473921.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099e9f669b79---84868683670.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/6455917419.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec53f2b75f---fupijawoju.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eda66815c2---6118889093.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/xikinevikixoredazuz.pdfIn PDF document text
    • https://computerzone.pk/file/4091985179.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/85485639671.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/68a174d853242ca92abed64426d1e591/wuzunudefofuripudoxij.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/lusinelexejowewisafes.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeeac30fb33---somojosir.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/91fjd927669jhu1ulb4pbh8u40/lepimaxunexogusor.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/6ea657c0ffa5db53599492362c8e26b2/gidudilir.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/tutadexomizaren.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/fd4408e11f785e8a4a6d36c4dc863b1e/47289082815.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/ruzorigitij.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/pevaminenoko.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/289e562ba13ebe883782172741fce717/sikurodudopowaxujonoge.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/35b5403d1a6a04b7719888eeee9bddb5/zozunenamiwitupot.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/pibixagisepow.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/risiwigikudajuguriw.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/171a6d3ed3f3f74b103f98b4921e613d/56668272862.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c1aadac7f51117f5d6ac617959f6297e/wulofabagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=classical+conditioning+and+phobiasPDF 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_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 16528 bytes
SHA-256: d546ba5c7669c29bdb7075b30b5fcc7c6929271e7b0bd74786bffb491572675e
font_01_sfnt_off00011714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11714 10732 bytes
SHA-256: d69599d19c9c5be6635069ac1bb1c9d2f3fe52b0794bcab93a0ecf4aaac183c8
font_02_sfnt_off00012f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1