Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3dc6c213e6186d…

MALICIOUS

PDF

69.8 KB Created: 2021-10-03 09:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cfa062a696711155df0de4e7f88b0cb1 SHA-1: f1d9ab6ca55083d65de6b7605ac4b0f5a9e20e90 SHA-256: ea3dc6c213e6186db1c12306640d81e4c5810c991ade70d797172067971425b7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. The embedded URLs suggest a phishing or malware distribution scheme, aiming to lure users to malicious content.

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 https://ketchas.ru/uplcv?utm_term=your+house+clean PDF link annotation
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/pasepekelenewiwepefemeto.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/30982c9c9dbb71eadb3f7dffecb4c61c/41481388312.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/73ab3a7b244645926aaa7ebfec421ed2/65799262315.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/zorewulilejage.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/81362569433.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/lujoxusewe.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/tepixosaxebanaseguromowef.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614964b178b94---nebuguwimunaxesuvo.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/xazus.pdfIn PDF document text
    • https://lasanisports.com/files/84879907308.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/soserotawupagitufegil.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/pokuxawop.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/vadagutabikikoze.pdfIn PDF document text
    • http://dharkaninternational.com/survey/userfiles/files/wuxeniwivelakisotuma.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/ziponitufajepigapoguno.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/jiroxaruwe.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/kezifozabat.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/miwefometojonikudikoli.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/ninumojor.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/wiruvevufipufidogujaworo.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/34294798122.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/btd5tgkjrbp75tvj8env0hp9ld/52315601211.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF4 10220 bytes
SHA-256: 66b0ab0835598e21a0fdfbe218b40ac108c11d04d7887947844a7df13ce0dc52
font_01_sfnt_off0000c6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DC 17220 bytes
SHA-256: ec00a17160ecf168214038067a5b9c883944a73b4320bd8a125c0401c72c3b75
font_02_sfnt_off0000f21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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