Malicious PDF — malware analysis report

Static analysis result for SHA-256 a351afbe16621273…

MALICIOUS

PDF

113.4 KB Created: 2021-07-13 08:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9e294bea65ae8802f6f89357d38bfa46 SHA-1: d0432165aa7cec351a608821b8bb5aa8b1ffa924 SHA-256: a351afbe1662127359d13c3b1f7197c3815f050873405dbdacc2ddc0c3345d2f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains flagged as disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The PDF structure itself is designed as a link farm, a common tactic for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://1-cx.com/ckfinder/userfiles/files/wesuzubimetemes.pdf In PDF document text
    • http://harc-ias.vn/Images_upload/files/49341277490.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/vadoxuzove.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/mojobosavexinutuk.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/f9ip2vfb53utgl2mcda8k0s3u8/kopuparomenilapi.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/20890695439.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/33124677452.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc0785b9d---93171097868.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/18285201266.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c27d50c9e8c65094728aba1195a36ba6/xuwosuzenovazironela.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e68ab425aea---jiwanisupigaxuru.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0357dc4451---tiketedake.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b564f2d468---zusopinerudedowemur.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160abf4c665781---zidolugerasatedisamegoxo.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160afd90460c0c---61875805900.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/tovulegemudebubuxiwitada.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/0ca205f9b0d0efdb46cab6ca2d02e24a/58023747849.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfb445a27d---74931592906.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6aaad9b10---62709921293.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/jopufiwufitu.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/5707499272f96702ef15383614e3a314/midenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=communication+and+the+evolution+of+societyPDF 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_off000159f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F8 17456 bytes
SHA-256: e9bd57795347eb8e4326b9218984fef81d1b9a2c0f3dbc0c656c556f82afaf13
font_01_sfnt_off00018711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18711 10952 bytes
SHA-256: 14cf4e52e2768c2e44ee4c9f56a637c80171ff1382ed12f779d13cdce0c83ed8
font_02_sfnt_off0001a05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A05B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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