Malicious PDF — malware analysis report

Static analysis result for SHA-256 98418003854430f0…

MALICIOUS

PDF

87.5 KB Created: 2021-09-04 07:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 52418e01564abf8ac94b942cd65128b6 SHA-1: d20658d2c11596c8edd274dacf5881c215bf6822 SHA-256: 98418003854430f0f3c06ec610314abcd5e1582e7b41bd7fd1e82fa4ad764011
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://altinay-law.com/images/file/jaxajebasonekuguzuviraduz.pdf In PDF document text
    • http://atsrealtyvietnam.com/upload/files/rurowusotegulugopadonuvi.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/73927924371.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/928700cbedf3ea2d6d6551808dc1450a/31615769161.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/86804029773.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8f5ed9ea4---nutuziwitiju.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/s7ujumhafmmoegutrhc2n5caov/xepitoporunuxomerurunidu.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/384401133.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1def8dc28---71320587762.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608302ffec487---daxexofilenujuwike.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/gunamixizosaj.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/zodapovesokul.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/mivatawumolemijejegimula.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/dinibeterudiwuxib.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/7d35474f4cefa76638ad7c76cffbbaf0/wiwavanejodetawobatut.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/xijakujopudevati.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/35795955310.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/xudojuvonilezozav.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/fesajezatakitunukusupu.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaab8ae536f---dorisasenir.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/146469084.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609412de8abf4---zoxomikuko.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/fot3lm2ova6s428c57t0uknhva/14596050815.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/55897789991.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d160617eb---84469226932.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/43106426205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=kabel+deutschland+premium+hd+senderliste+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_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 10996 bytes
SHA-256: f7706e67964f5c95e3730e5ac9e51b2a11ddc3db3151ca3f0aac4e2504776180
font_01_sfnt_off00010758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 18744 bytes
SHA-256: 3e8dd60bb41d986b68dbbe6ef618e424a867c600756a6e6774c635e7ae07c414
font_02_sfnt_off00013792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1