Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0e4ffd5c4c8261…

MALICIOUS

PDF

91.0 KB Created: 2021-08-03 18:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b089f92e0006fc61288886fc48042df5 SHA-1: 06085e14f2209df04e6e35c0de595f57c4cce323 SHA-256: ac0e4ffd5c4c8261cbc1e712746af83ceb3539c0f881d98bc055229d9756e236
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a secondary payload. The presence of external URIs and a link farm heuristic indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/laduxufozenof.pdf In PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/83576c105fdf9b6228dde838aed3809a/jefozejezuvunananep.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/bthne4f9asqsl7ss02rc7qta2h/95161824023.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/lexurepimidudut.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/80129730931.pdfIn PDF document text
    • http://dothi.info/images/files/53631853747.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/10458971073.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/11429172341.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b74dedbfa09---95058295801.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/75708133415.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d861c2afb---vajofofojofup.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/9f538b1361291bc22aec4f3c68d3188a/lapixisoxa.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/wuzebidajarerimonasomab.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7d809579b---rewetovepexanebusofuvage.pdfIn PDF document text
    • http://mhs69indians.com/clients/864804/File/nefafoditumul.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/dbfb77e0f1746a12d8b2e84586971973/rerurokuzivakiverep.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ell8tjvrk7vdt1hfjuqkp9m790/ruvudof.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/33517746449.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dbf32a0fc---kerujasoxi.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/82906b5fb405d7c499e48605e9e455a0/zekujevoxojawudiw.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee08bc77273---dipenulifibelotabid.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/r4n4itq57pddp0jp7lvbriefgc/zaxamabavilozopewaje.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/kakalowu.pdfIn PDF document text
    • https://okazionche.com/files/68523406191.pdfIn PDF document text
    • http://araonline.hu/uploads/file/juxanesenifadepe.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/i2aj39j97vpmqr0famsvg9mki1/45737786221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+much+is+apex+legends+new+updatePDF 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_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 11140 bytes
SHA-256: 970a3d84893fa1c85c8d4fb956d6f488d9547e9491607aa3671ed25183b320dc
font_01_sfnt_off00011745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 16868 bytes
SHA-256: 89c09caf78433cf1757175907b8ca36649e0442739a8709042aa88aa1d7ab68c
font_02_sfnt_off00014327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1