Malicious PDF — malware analysis report

Static analysis result for SHA-256 35340f67d88be6d3…

MALICIOUS

PDF

78.1 KB Created: 2021-09-19 21:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1eab00ab6c39bc4a705b2eb69f8518e6 SHA-1: ed159c40ad15b6d831ecff6a5f1d0651bca51718 SHA-256: 35340f67d88be6d35fd1c0b5ee8bf45b04939f9c51dd16de71e4136ad6b60cca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download further payloads or exploit vulnerabilities. The link farm likely serves as a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://forexinc.ca/upload/editor/file/56517579284.pdf In PDF document text
    • http://ranjitabiswas.com/userfiles/files/13999311762.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/51587595637.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/93643921473.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/8775815793.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/murinafasa.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/81883738110.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/81854206548.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161425a81149c3---ripenapapedubasafip.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea7a350650---24575639146.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/22646925442.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/29351353096.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16134d60f0fd41---7121389029.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/23614600258.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/60639805030.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/revawolib.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/pajopifewitijosafomol.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/45379931334.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/ximefimofawumaxubogat.pdfIn PDF document text
    • http://jawarakreasi.com/file/nosetib.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/migivali.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/50876189499.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/68bc470004f37d6a8501de0a249f0ab0/85340711485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=full+screen+caller+id+android+10PDF 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_off0000cdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB2 10516 bytes
SHA-256: 95b2074687b5748ef79e641eb2ebd2e17fc04cfd5b72fa51360f3cf9e9f74ddc
font_01_sfnt_off0000e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 17220 bytes
SHA-256: 2a7474878ca179854c3c96c1b0fc59e0d0dc7f5be6b05e93f8d514b8014dbcea
font_02_sfnt_off00011274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1