Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b0625a506e9a5c…

MALICIOUS

PDF

84.4 KB Created: 2021-06-20 12:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0885f4f67148a7ea2402d26ab99e296b SHA-1: ac77629feaa40f99ccbf7a5767e244e853173573 SHA-256: 35b0625a506e9a5ce9ddd29e61bfc02f0eed2acf13b129dd1a1552e7cc07e177
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://strechybenesov.cz/content/85100847830.pdf In PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/d820d2634e2ec877ef78af0194252120/fanowejajozafeji.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/87710032777.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2b2faade4---67707292932.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/jeegrqeg3v3qab3dbtd7uipro8/nefelos.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097a4eee36e6---weniravo.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/jarokuzogiwido.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/64dfa051711baa6d5fccf37c90fbdb4f/wobodadurugapevu.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608980e9798ed---20142008109.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/fe4e3bab612eb397a2150355f08b429b/jidumawu.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f074330bd---75811997446.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a8d7bf254---32705614555.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/8275511398.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/49d7182ecd43ed978e38586e5dad5d46/vovitotirufegojovu.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/91720220450.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/de177bab9995606cd3e9446fece7d0bc/dimedexizimupisisitobusut.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075439445a08---54675940562.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=wings+and+embers+sarah+j+maasPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 5032 bytes
SHA-256: f2427c101c77e348ee44a208ddc1b27a5af5f8fc55800c78ce481835a0d67e05
font_01_sfnt_off0000f885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 11060 bytes
SHA-256: c0b9967272856f2fc4802d12f959db49f144a6284c0bb729e15bc197afb0a269
font_02_sfnt_off00011e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E03 16984 bytes
SHA-256: 7e4daa3367bdcff7cb3a03c20d3f8d640c49efd117669a0dc39ead261ce0ea43
font_03_sfnt_off00013629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13629 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

Open this report in the interactive analyzer, or submit your own file for analysis.