Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86ed9abe639674d…

MALICIOUS

PDF

131.9 KB Created: 2021-08-14 20:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7a76e1e5f389cd6ea2c88b8802ea1d8e SHA-1: 4afcc22406af1baa621cd1dd15b90a448c57c3e9 SHA-256: c86ed9abe639674d5b89190f590d3a0c21ec2000a257f5550b102d41d63a5e1a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites. The heuristics indicate a link farm designed to redirect users to other malicious PDF files, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://irlanc.ru/uplcv?utm_term=6+facts+about+langston+hughes PDF link annotation
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab1b35d015---wavewoximuragatubonabu.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/4837328383.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/2c0dc76d23d58926b9d512e6ff6d914b/furorasakafuxeb.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/41773669278.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/gugovogagowovisogajaf.pdfIn PDF document text
    • https://samowar.ch/upload/file/solilifezafeje.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/88820899104.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/qiarv4a5qcl118fpn0gp1k0192/jepajiralawa.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16100db00ba5d6---naduturisunav.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/368b66d5837da9b51b4ba38abfc20a6c/jesetidugulakobedazazufu.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/958bcda36f554fbda07479b082e319fd/53475890597.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/numulufezawimazulera.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e425315261---devijuwakabo.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/povesikorozeruk.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/37480090033.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/komomejoponipiga.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/053878dfbe94cef90b1bed37984b91d9/53381924493.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/74556417849.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/eaf7ba41aa10224f9c680fb0f5b0b29d/fefebujilejutowunodid.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/wowuviwinekegone.pdfIn PDF document text
    • https://designclarf.it/file/58245348807.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/pudixamabavubovawixuju.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/aca7adf57120375c86cdac5c9901e076/wilum.pdfIn PDF document text
    • 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_off0001a1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9BB 18364 bytes
SHA-256: 3c1a1962a0d80fdb1b49d70bbb2a6e388e1547f13b60f86e65fcd1f680e9659f
font_02_sfnt_off0001e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9A0 10736 bytes
SHA-256: 279b5e858c4df53c979c3a956f00ff3165e856b90f388912e784c4babec66946

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