Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d57b36cc1a2e70…

MALICIOUS

PDF

87.0 KB Created: 2021-07-04 05:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 741de399cdb817eb4190fe5015e26adc SHA-1: 2f631a134ad059e06fcd74a118a844245f7e6127 SHA-256: c1d57b36cc1a2e70becef163fb5795be884ffab4051496849a456f29ea52f4ac
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf3fc0a7d2---zolovavufimulurigoz.pdf
    • https://steammining.com/userfiles/file/bipevukefarevetetazavesen.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f46cd68920---vinowadomigepigabukugeno.pdf
    • http://paillasse.hu/userfiles/file/70737687205.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e2d30d71832370db25a07b53b134bfe7/jerutovu.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc9e3ba80---44219205975.pdf
    • http://scmsalliance.com/clients/864514/File/77839627876.pdf
    • https://textolinguisticsolutions.com/upload/editor/file/misexavi.pdf
    • http://bronia.org/userfiles/file/25480894239.pdf
    • http://j-line.ca/fck_upload/file/setegakugedirejafijuwosov.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076582ac1f33---86446137666.pdf
    • https://ambient-interier.cz/files/files/88500515394.pdf
    • https://alihuata.com/userfiles/file/1894580525.pdf
    • http://indecomavo.pl/inc/repedamofiwelolos.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba912ce64e5---18903255982.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076143d266db---xizubidovuxagopezubok.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/86c4845fbab2ea7336dfa10aa0083561/51214272459.pdf
    • https://essaidafm.com/uploads/FCK_files/file/81994747585.pdf
    • http://kraski-chernila.ru/resources/file/4520779727.pdf
    • http://cesishotel.com/res/wysiwyg/file/6051449853.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/08a73ac89e45cbc74e9608577a9d6b61/11148774293.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16091f6d8164e7---86716522639.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/f566409a625651dba082d7974eb0cdad/75337957799.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=biodata+for+marriage+free+template
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f160.bin
0e2b6b9b60cc03991912edc363958c343adcc36caba6984cee9363bcb4d5e772
pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 17272 bytes
font_01_sfnt_off00011e8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 16792 bytes
font_02_sfnt_off000136a3.bin
29453698f590dac04cc14337ef6cb73d8d059e867f3e3ab294875ee302942ce5
pdf-font-stream PDF embedded font (sfnt) at offset 0x136A3 10620 bytes