Malicious PDF — malware analysis report

Static analysis result for SHA-256 a049502a21f26d8b…

MALICIOUS

PDF

86.7 KB Created: 2021-09-04 19:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: edd0e54bd08771484e0a50789069ffde SHA-1: a2e088a57b5f93a79c82a3098de22380e8ae5e34 SHA-256: a049502a21f26d8b8013f1c413ab66c4ce3209d6c402886acfddbc71870113c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://oniceh.ru/uplcv?utm_term=nest+thermostat+manual+charging PDF link annotation
    • http://oreade-breche.fr/userfiles/file/60482892087.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/59893140613.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbad5010d9---15905024606.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/it1bm7vctinda1dg0dpf63h3lr/43489727318.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/foxewerexemunigegirolo.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160944aa3257b4---relobemofug.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/dd6ae6031279eb52fe99094ea93ef69d/kufov.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/94968504660.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/fonujojemebezatezavibi.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/7713098072.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8c4379797fe6f92a08b46681ae4f2a02/48322950560.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/bopomunuxa.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/dopelatepiwumatin.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085872b75921---99640573534.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/toduxoturogiruzilojo.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24971512f1---48692045133.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/62835012995.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/00c5d4deea40ba871154394728497f41/80349746356.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/tumimezexot.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/2f847337f989d62b073b2ea5ff05fbd4/94592743562.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b46e145763b---90040993708.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/94018336670.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fff318181f---tizewe.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/d95510a2105cc41cab849a2b87098730/wozabisitomezabaliwu.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://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_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 10752 bytes
SHA-256: 7d212e00acda7f66dc5c11481ac1cd76b602e981a33309c3bcb6d8966e40cfbb
font_02_sfnt_off00011e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6C 19760 bytes
SHA-256: dffafd292ebf324ec97e05bbec810b9c66bf8e9f53795973e89d529b778ebdde

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