Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea0c21ffec00bb5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 17:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe4e967a4e200c78ee2b0dd92c946749 SHA-1: fa9057ee9ad0b6e9643aa66da08969afd3ae77d8 SHA-256: aea0c21ffec00bb5387e16f9c9cd9d22a0738a1f9dc7cedcf8ebe433395e5f5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the primary indicators are the heuristic firings related to link farms and the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://jamisonfurnace.ca/userfiles/files/reladapalekuvixade.pdf In PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/mosoxopapovel.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302f472a26d---19256541639.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/3533777415.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/70562306580.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/26641648863.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/xakudunofoxov.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/8754295277.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/11586281632.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/vikimikidufudenoxosorebik.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/xeputoj.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/fazugikepogofe.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614262ed5bd2f---bepumixijumojifi.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/61744626369.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/48296956800.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/35245220641.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/a9f21990d57be044798c61f1b6c1de63/lasewimigagofux.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/062225284217.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/punimira.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/30412367405.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/2445264062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dragon+village+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_02_sfnt_off0000e830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE830 10320 bytes
SHA-256: 28b8712f1da9217ea6c09d5177db58fc5163b13db932cf0cb5c990c19bd0dee5
font_03_sfnt_off0000ff80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF80 22372 bytes
SHA-256: 949a216f6a63ea29acf4d2aa85eed540f30c852655f31280fb01870273e95979