Malicious PDF — malware analysis report

Static analysis result for SHA-256 59085fcd255d3aab…

MALICIOUS

PDF

94.4 KB Created: 2021-07-28 01:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19994b963d64371f2c7f9270e1e14cae SHA-1: 82e6284581c511f16528392f20d9c180ca334553 SHA-256: 59085fcd255d3aab560b0cf5ebf281eb9442c38d9d454a64f00557f08756d8e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised CMS upload directories and disposable hosting. The embedded URLs, such as 'http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/7dd6cc2a076913a5be1ab199953ab100/17814893080.pdf', are likely used to host or redirect to malicious content, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba3d2bd0d0---zevojakegibag.pdf In PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/20429207006.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/gomowadipugid.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/16efa9c52f25f303d18a05d8268a6e69/30115982811.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/manaxusemulifivunize.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/7dd6cc2a076913a5be1ab199953ab100/17814893080.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/33971912964.pdfIn PDF document text
    • http://xycrusher.com/d/files/zisumekesojevulumu.pdfIn PDF document text
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/xamugedobegep.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/rusowelapumuwafo.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/27979523423.pdfIn PDF document text
    • http://clingac.com/d/files/76127793917.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/45891414657.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/63723560249.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/wirupegoxokesobeto.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/jupawota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=kali+linux+tutorial+2021PDF 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_off00010d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12583 17956 bytes
SHA-256: a2dd842eefb204cdc0f9bbbf9cbe2abc6f155629719f75f08d2481d79c60cbd7
font_02_sfnt_off000154b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154B9 10288 bytes
SHA-256: 21d4049bedbb6e76f3d9c0f855fe6432231a7a8468642785cd38655c411c1ce8