Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1ff03786906dc8…

MALICIOUS

PDF

135.1 KB Created: 2021-06-28 07:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 45f2b129ac6498b9fee3bc5b5ee4822a SHA-1: de2d176e0c543975cf2a3b1d387bc8bec0d528f4 SHA-256: da1ff03786906dc8a393549c83d2b60cf2f8deea9a6cf2e876b0039ac976e797
196 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including an ML classifier and ClamAV, and is identified as an advance-fee scam lure. It contains numerous links to compromised WordPress upload storage, suggesting it is part of a link farm designed to distribute further malicious content. The document body is heavily obfuscated and unreadable, but the heuristics strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607517721fca7---xilexugegado.pdf In PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e4c69ae7f9029a34c83f5ad86791e845/80118394339.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/c53c8aeb4571d13bda69092598496376/pewudejawi.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7b00c36aeaf6f6fd1052e79422ceb8e5/sopupimutipezi.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/ir6f59f0di2u5o0p94q9a5i3ef/68945841156.pdfIn PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/fonaruwamof.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/difedilamotobonuridovov.pdfIn PDF document text
    • http://ruresept.ru/files/file/59875781360.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210628070255.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf11e518c9---gosuvivuxe.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/gedijenunetigab.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/537d5680fc83d0f21ddf536037a9dd7b/sobewu.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/11964239617.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce150f68345---62887160313.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/s2j72p2i8ldce1mjarsi2kna1p/5361230100.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/pajevadobojununutopalu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/l7a6dkrfthuq0j4juloco7k3o0/zeguganelodelezatuvex.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/vifajamom.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/51747082cb14ae859007c07a42e76406/koredosuwozisigekivuvunem.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086464e5115d---53197821327.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/dupavogotezetatawi.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/tivopodalulubakewerufij.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/40672185425.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/671ccrflo0jthnmo5abuhe12u7/lefepadez.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/470dbd852c69a85711d2a872e8ce0c65/21395060197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=meaning+of+gatsPDF 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_off0001ae36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C648 18956 bytes
SHA-256: e71ab54cd84f108a2be9f08f8187a9b29adae1a2ad4cd5df08e7eaf1190944cc
font_02_sfnt_off0001f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F78F 10236 bytes
SHA-256: 8d1c9ca674d31c5ec0f70d977037100815b9ecbcd1b3403d64d2ba9f10cd4291