Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d18753e08c3bba9…

MALICIOUS

PDF

87.5 KB Created: 2021-08-10 20:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6bc211898db7673fceab1ee52657e881 SHA-1: 5d539b1a32ed6614cb8c1e203aad9fa7d6dc6090 SHA-256: 7d18753e08c3bba9b28c7077ea2006937644ded000ed8811b6b3a95ddfe2b386
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and link farm behavior align with techniques used to distribute malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ea3203270---44439227861.pdf In PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/8pqumd402jfbgm16m46h2231j8/32823294454.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/mewiwugovobekari.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/zumavaxerefiden.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb78b6c13c---1001027430.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7182e22fd---lixosovaxabobud.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/wazevepuzodufalin.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609764fa774d9---jizurikisazufusepoberores.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/au4ol05iqgn0v29t73j1befrph/lirusenufuladatimikeru.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/nubifibipilogawatavo.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/19083838850.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d47056a3561---bamatuwilisugeguzosevad.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d2ac3e31f---4501734665.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ebd758cacdcefa1822461c600cf8c0b9/38076152256.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/xatejamabarugu.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8866e9814---49280070952.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/9983294270.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e2f27cbd9---59642047362.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dda2c913f59---butemesifotonateliz.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/f3a2d87cf56dbecd4cbc7c6c16b0ad0a/67788697235.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/51648701961.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/50780845621.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/butuwuxibaredazija.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/wigugidosetexivuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=aspectos+a+evaluar+en+la+evaluacion+de+desempe%C3%B1oPDF 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_off0000ed6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6A 18508 bytes
SHA-256: dbba088d2cddfd2a2b49f6055222d84775cc1b6365791de7e632c703893dcc7b
font_01_sfnt_off00011bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDA 11028 bytes
SHA-256: 8f647e31eaca2b59cf03646ab9788e79d0263eafdc6180a14e49f82754d3c33e
font_02_sfnt_off0001354d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1