Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f8c275a57632ae…

MALICIOUS

PDF

78.3 KB Created: 2021-10-20 18:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f3fa2a3e2935bc5c9329c8f6eb5c8e4f SHA-1: 67e8ab693ff7826858db5f8ef204e27a291edb6a SHA-256: 58f8c275a57632ae73b01dc2a93b3d0d88d110836d8db1b2cd276749c6746869
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 functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users to malicious content. No scripts were extracted, but the structure suggests it's designed to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16164db0295a1b---wewire.pdf In PDF document text
    • http://dlzj.net/upload/files/2021090408271441026.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/jegejaloduwegotuvimokod.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/gekoxur.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59637627704.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c10fc4babe---nalalobifafagatelag.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/18169592013.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/navopafikadep.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/guxakademevo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeccf7d811---jimakuvosidukijokoluwosox.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/remigumatoven.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/75595132611.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/67398019728.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/87468952627.pdfIn PDF document text
    • https://lesura.net/userfiles/file/pebokida.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/24833759230.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0948307f4---62491009815.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/24559966116.pdfIn PDF document text
    • https://efnnma.org/files/file/67703543755.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614049d71780d---wusedisagomug.pdfIn PDF document text
    • https://clove7.com/userfiles/file/gemizaritenagabup.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/fatetunogire.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/u-9XGpgKpwY/uplcv?utm_term=laws+of+logarithms+examplesPDF 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_off0000cca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA4 10848 bytes
SHA-256: e87c2740fb78ff8941d3d033cea888cbe2bc833a1976c5f09f92a6c70f9527ee
font_01_sfnt_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 17744 bytes
SHA-256: f23506c269929c846ad4b7bdcd2049a004523a38bec382a86b92af5dd64ccce6
font_02_sfnt_off00011432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1