Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d59439d0507221…

MALICIOUS

PDF

78.7 KB Created: 2021-09-08 02:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8a2f15ea2157ebac39a2a81e5c5067a1 SHA-1: ce29a4a3040d2a3c7002e937cdf67b8aba3c38d8 SHA-256: 82d59439d0507221a2f0f08d723c838f91f22ff7aa01b4a753c22d60a9711ec7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing the formcraft plugin for file uploads. This structure strongly suggests a link farm designed to redirect users to malicious content or phishing pages. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c7bd5481---sagobojotun.pdf In PDF document text
    • https://eklyps.net/images/file/59435098271.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/32409624714.pdfIn PDF document text
    • http://vantainoidia.vn/ci/userfiles/files/31707606356.pdfIn PDF document text
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/sekofosexo.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/12136350925.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/63309684941.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160855880ea518---48720425690.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac682252cd0---22339025594.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b14642401b0---vorokoxa.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/27127347157.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/48123433997.pdfIn PDF document text
    • http://classtool.info/upload/files/gimajejaxifunajobabeto.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/85561802964.pdfIn PDF document text
    • http://usagimatur.com/files/others/nesoduxupixozuxirutupenab.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/wolonilin.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/bideligaviposez.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/tgrp2ulqioo46ocvtcssvfhbj2/9741346323.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/23075f51b0a029bdd38c59cb4ceab617/82427576314.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca75ac21c---taluvunufuwukimoke.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c269f541b4b---zopawadajotavemefapovo.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846b2d1df2d---9462456579.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/95336008737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=banking+awareness+pdf+2019+bankers+addaPDF 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_off0000cfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD1 11244 bytes
SHA-256: 4c5d539e0b3746b9f7d5cb98b25e68c121cf669643bed28b427ce64b2a88f047
font_01_sfnt_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 16732 bytes
SHA-256: 89eb20c30e976d1e6a428133681464bd8ebf971f764979d88cbda349cbc62008