Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9f16e227a00969…

MALICIOUS

PDF

71.9 KB Created: 2021-09-11 08:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b2e9693e54d330f53c16159add05f7b SHA-1: c72afb6893444763b21cee99986a39a2eaecb06d SHA-256: fd9f16e227a009696bc853cd5bcf72f77007fdaed08c27e11f12d2560ead889d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://coretry.ru/uplcv?utm_term=how+to+make+an+audio+recording+on+android PDF link annotation
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/m2ca719gmfdto16qilqs0p21j0/serezopowekebosuvo.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/woxaralomoranisukur.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/sutisapobibidopogepigobo.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/31972903887.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333a173fe94---resuzivos.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/fifazetuk.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/posaravotanojizuxokusiw.pdfIn PDF document text
    • http://rnralpha.cz/res/file/zigutoramimur.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/23127642060.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d77a8b9f7---30612817341.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613794fb13522---lapalikawex.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/74955346569.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/fagaxelowokejufowefekaxi.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/85502163424.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/vogekamolu.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/dopaviroresof.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/gedalimazomufafokudo.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/jovazob.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/wabagegus.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/80050564164.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_off0000b6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC3 10768 bytes
SHA-256: 9de3688f00e302a9108a281213a7c29aa94ee0301f5aa56d6588a8d509f5274f
font_02_sfnt_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 16836 bytes
SHA-256: 9a3553517b48f449d8e726b926b8b8202a8bb1f2197491b606a6d1c190b49018