Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5dc1e82b595e9e0…

MALICIOUS

PDF

76.4 KB Created: 2021-07-23 03:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c65f21e0b239ea1d189aa310a8a0df4f SHA-1: 28dbee2d96a89148e99a02ae1237f43978e26931 SHA-256: d5dc1e82b595e9e09149e213b8c281295143da95301531a556b95d3baf497f13
176 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a callback phishing lure. It contains numerous links, some pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content or redirect users. The document body is heavily obfuscated, but the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a link farm strategy, likely to obscure the true malicious destination or to improve search engine ranking for malicious content. No scripts were extracted, but the overall structure and heuristics point towards a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://kbchina.de/upload/fexofubofirunijiwagezejod.pdf In PDF document text
    • https://suksesunited.com/contents//files/88918104434.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/mereluzarakalupuxironudaw.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/nadiv.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/8c6887be9f4127d803f606be05f7cce5/50724529581.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb891585b6---39236157642.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/wodaxuzanojufimoja.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/1af8uf04qocohgnu0p1t6rtqb0/95539811932.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/acfadbbd658ca19f9e9436b86a979815/zonabiwufimavopogozilox.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/votimid.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c68bd2900---telizebufularowinaputeli.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e09ee100c5---6142145857.pdfIn PDF document text
    • http://webursitet.org/Files/file/34137372608.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/91f9881d43e54a3dcc382b1ea3857e60/bomixixulirirebuji.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/59495500420.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/d0tuvlsmjei5g58d7u763s8c36/30272899587.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/xepevaloji.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/mizusoravipoko.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/kolab.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/tebigesenojefegolebuk.pdfIn PDF document text
    • https://ubranni.com/uploader/files/54754442498.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/34636193509.pdfIn PDF document text
    • https://maturana.cl/upload/file/91727060214.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160877d788921a---tijiko.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cccaa90932---fosokizopexaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=lucent+general+english+book+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 11188 bytes
SHA-256: 380d407d329a73f23c215ca1a1f74c543b1370f0b05af360a7c1d9a6ef657cbf
font_02_sfnt_off0000f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 16616 bytes
SHA-256: 266f4dee9eac0c0fe20cde538a838c4e524a0bbf84878b2ebe60b72267b59bcd

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