Malicious PDF — malware analysis report

Static analysis result for SHA-256 db63daff26f7d97d…

MALICIOUS

PDF

91.6 KB Created: 2021-09-03 15:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe0bf131264ef6ad02123a4c469fd6d5 SHA-1: 6dcfafdccb2e308fdaf3903ffc96bc3ff4fd8dfd SHA-256: db63daff26f7d97d4e235710cf6dd0db467a87d0b5ae47e7e8b69d61685cc07e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS uploads, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094276a4f489---kofesumiwifewilewaloluni.pdf In PDF document text
    • http://timnhanhonline.net/upload/files/kobitosun.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/ravisosekizezojot.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/tifise.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/nilemirexeruwugajize.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/7d24edc264ac18c8293b1b617ddc10d8/69471291264.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/siwigagux.pdfIn PDF document text
    • https://5uempat.com/contents//files/72805911396.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/pisebexudep.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba548d96ebb---siwiwivi.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/nufekidefumoxurej.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/jalopimetirigejonas.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8f419621d---tugagakarazimes.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa644249646---texenidadegiram.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/zakiziwex.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/lopibukuzi.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/20528837007.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/petanorejiputizowojog.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/4ddc033e30c1c120233b57fd57a28006/pugojiwavunujetozumos.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947de28e519---10306580609.pdfIn PDF document text
    • https://icbacademy.com/upload/files/waxogovarewiwogipi.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca33cc4f3b---bozumodatifepolir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=feasibility+study+on+snail+farming+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 11172 bytes
SHA-256: 0b04896fbd5bfc70fa3c94bcda5c1a35344fd4d7f90534b8daf0b3aaa1c18460
font_01_sfnt_off0001181e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13030 18508 bytes
SHA-256: 111cea391c1444797ab5e50dcd272e3458b7d745b5fc58b3eeaf9b1a588e9dc1