Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd578621abfa3c7c…

MALICIOUS

PDF

74.6 KB Created: 2021-09-02 01:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f53e2affad1a265271e430c8bd37ef6 SHA-1: 4240bcdb7aa73c09a25c6a69462ebe1332995562 SHA-256: bd578621abfa3c7c0bd4d96987630f0d99fcbb24b615899b084e763795f90f64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kotata-zlin.cz/obr/clanky/file/85172846141.pdf In PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f030b71fe31---xurajufinunuromiguxije.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870c9499bb6---78174299897.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/vufowuganelebubafuzedolev.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/duperajoxarelijavomuw.pdfIn PDF document text
    • http://megalaserasia.com/upload///bivitidutefobolute.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f22a4d6d0---41173538426.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/e65144d934f7127a896716dfaab093d6/21030320677.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/nudepuxidiximip.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf99b59964---75054103407.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/14219258479.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/vafurov.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/nerajesikar.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/6503098135.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/87433484873.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/n3e2kaboajlsag1386736l1pl9/gubafavazemisivosafizij.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/14oppomuecfgatiks97u0o8k2e/ruxededoxemepom.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d39c14fdf---82797646727.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ads8uv6d1l33gd0d7e16shtdtr/32418517714.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/24158166989.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210806202129.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087cc1f72667---72723270988.pdfIn PDF document text
    • http://www.radiooro.com.mx/media/images/uploads/files/13565683444.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/glrv4q833silh26upn3ho3m7mq/38809692891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+put+a+line+graph+in+wordPDF 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_off0000c19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19E 16576 bytes
SHA-256: 7f4939ef0528ce05af924347561dd6e2b54da76796e52d76ba56094e54e895d6
font_01_sfnt_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 10680 bytes
SHA-256: 8016a583c359f05f38fe3772cc1f4d81ab2493910c6df79f51a2ff6e74cf0b6a
font_02_sfnt_off000104c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1