Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ab6507e6a872d6…

MALICIOUS

PDF

87.7 KB Created: 2021-07-08 10:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d19176caee3cd58eead36beec923a8fa SHA-1: 2290f7ea95e72da126b8bb0fda349a91aee94e3e SHA-256: 93ab6507e6a872d6c8062ba7747844f841373a9ed6de8e0efec049317fcd3a4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are part of a link farm hosted on disposable domains. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://zulassung4you.de/bilder/file/99532842698.pdf In PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/v1qdlg7lmitd2p1dtascejt9f5/sowirik.pdfIn PDF document text
    • http://stevis.cz/files/file/37816428670.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/tofuximimozivarenavofok.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3905f35706---jalinezexuveponudakexu.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/88218455415.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/fazewado.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f5e8aaa6e7b1a965b7601a3cf6fb0f00/bogefotimupaxagukowiru.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e69296ce5---dovajagupadakuve.pdfIn PDF document text
    • http://reneenicoleevents.com/clients/865995/File/91912446265.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/83363540707.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c3a6705b7---fesikadovaxefum.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/7674535378.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d0797409e---2773894733.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/t6nuolvo333narsj9jti9nk511/nirukuwivabekunefisevufe.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/1c076249f22ef0609f4048d5c57b0d76/2821397409.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/60ce037c6acf47cdab1ac29727d2be5c/feberemi.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/uhpl0gc32mfvvfmbarb8sr2fp1/87591493447.pdfIn PDF document text
    • http://nenorm.com/files/files/10454395246.pdfIn PDF document text
    • http://adveotec.com/img/file/vuregosemomavunamimibeboz.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-3/20210603093244748464.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8879ecc9f3---96637516315.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160718aa6e27a6---16896764403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=data+protection+act+2018PDF 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_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5D 10656 bytes
SHA-256: b85c2472cbd878683984f39f0c5f47af17c200da9a84d3230d14cb28171ec092
font_02_sfnt_off000124f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F8 17280 bytes
SHA-256: 5491dec8617203bf2ce8797c30fa08e4d999ecbfc2001e20164a8920c66168be