Malicious PDF — malware analysis report

Static analysis result for SHA-256 da69a673f62af96f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 05:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5d0f890364a8a841c5d61d9d0a99b0d2 SHA-1: 0dd6e537743e431339fa609637269a6253bb7f18 SHA-256: da69a673f62af96f96ce9b9b926daaa74c771a1ef36f4d96db5e7b50b18f9083
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to compromised websites, many of which are hosted on disposable domains or use URL parameters suggestive of SEO manipulation. The primary purpose appears to be directing users to download potentially unwanted software, as indicated by the 'utm_term=download+procreate+apk' parameter in one of the URLs. No scripts were extracted, but the heuristic firings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=download+procreate+apk PDF link annotation
    • http://harmonie-avion.fr/actualite/files/96373791495.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/29270686593.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/58ma1ujl6ddithnkjggvbjo5mu/77536483765.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/9851097967.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/30898409405.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fb506d737---tapakajuwikifax.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/20052198571.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/j9muj2j07jh8prd14blued15hc/sesaparawokobowal.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/edd0c4b94d8ffbb65c83cd532389b319/1595206254.pdfIn PDF document text
    • http://davobio.com/upload/files/31341366616.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/51405498334.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/kuruzaj.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/11291555638.pdfIn PDF document text
    • http://drironcat.com/images/file/7558315505.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9c066b22a9dbbf7140157476e053d228/5484440424.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/gapogodef.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/53638088885.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/5986248280.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613461f1943f2---97455851560.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/33203458263.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/kixidujabimolulis.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/tugagopetezotazipov.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/17135755046.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_off0000d9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B0 10424 bytes
SHA-256: c2c027bff2e3c6fdcb0f16405c6b3a2fdbea77c153f0ebefd4f1b234b5862838
font_01_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 18276 bytes
SHA-256: 81a3b105ecbb52a032359ed292625ebb10e1717151302326d9229ffbe4dd3f72
font_02_sfnt_off000120c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1