Malicious PDF — malware analysis report

Static analysis result for SHA-256 52adb2f7512c078c…

MALICIOUS

PDF

89.2 KB Created: 2021-08-16 15:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c04cf4954745deeb37c24a96b934e540 SHA-1: 977525964279496db47e19e92fff269eb5477e8c SHA-256: 52adb2f7512c078cb09049c40544ce5557d0ad5e1632638576b999641fe9bfe2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://webmenuplus.com/images/file/67275597424.pdf In PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160900fcddf409---lazuruwetivif.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/wuvirutik.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/3183700ae60cf9201ff8391e37e3a64e/vupikaberorejoruzas.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0265accc99c9a6e21d7b0e8dbaa63013/93332551834.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/81996738369.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/82777233352.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/23388202513.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/88278556460.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd34ca0193---52835671846.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/82012949818ad8b03a2855b7907058ad/lexalibilewim.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/tumagasatebazosubilitora.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/0f81eb5f1ce26c061ebe50ac98ef5ef3/womaxigimobopinix.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13947d44c---16242367705.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/11892045283.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753ffb5b788---posakijinowasubuvepik.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffe852f797---nulajigugizonivuwotejo.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084e2b819e85---75006563710.pdfIn PDF document text
    • http://hasyo.net/files/file/14920493853.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd070a1e37---debutejejukozeduw.pdfIn PDF document text
    • https://fasaac.org/temp//files/ferug.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba42e6c61---97751677107.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088f4ed28d84---31338498236.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/fepunisalofuseli.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/75713588397.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/4adc21ee17a2f6f439a25391faa68ba6/rukilawekojexediwabobazim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=texas+unusual+lawsPDF 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_off0000faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 17560 bytes
SHA-256: 7e3c022c6c8f70b3af63145d991039a66edf281b03056be7232e4d3ca49f73bd
font_01_sfnt_off00012823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14039 9940 bytes
SHA-256: f041110d5ab1227186db1dc8190f2631b8e8f5c5d0c8fc7d58624f713e4d38d7