Malicious PDF — malware analysis report

Static analysis result for SHA-256 fadaa0fbd93c145a…

MALICIOUS

PDF

86.1 KB Created: 2021-06-29 09:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: c23d881c07d8510ee8bed32593d437d2 SHA-1: 3b56c271c8f95c47732cba61bb4405249d81cbe6 SHA-256: fadaa0fbd93c145a09020107c67c4d5fec70da44e07b263b9e80309184563edf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=a+trapezoid+with+two+right+angles PDF link annotation
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d60c5b4dde9---29561377484.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870d0a1669b---kawegafo.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/wobes.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/tigonewupaxixijerevixexaj.pdfIn PDF document text
    • http://thongthien.vn/upload/files/muwebasasotojajek.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/ritikaremopirokovanezezi.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/ab4c5036463a7aa2305d47aa2986bee6/poputuzugo.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b078ea48a---92783328414.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/xonifevinuxeliraditime.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6243ee399383f35ccea2eb128d876524/15816268875.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/54033623728.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/l6brp3kn3rm9cad6cod8mfh2uc/5705186014.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/28379313233.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/fikujekewusosa.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4148521e1c---tafezejimofagififejunabiz.pdfIn PDF document text
    • https://topupdana.com/contents//files/92899765641.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f9fbbb065---14771492898.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8b1d8ec96---23805839312.pdfIn PDF document text
    • https://avenue102.com/uploads/file/vewimomewili.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/gukokowatole.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/rkqc3e8nbup2oui27qokak2671/vuvuvadowejikonaju.pdfIn PDF document text
    • http://bjallstar.com/upload/file/nupunujozofemosofavuwi.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/36305f12616c46d787cbdd263b016f8c/rozonagola.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/54823123671.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_off0000e0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 21976 bytes
SHA-256: 013ee26900f6b63fe17955d042a5f8c93efef77c7c2d48863f51ea4c009622db
font_02_sfnt_off000130a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A5 10800 bytes
SHA-256: a4af7aeb3dc7fe08f8747bd4b5c20034c88620d15fed9399198da8ef6423e228

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