Malicious PDF — malware analysis report

Static analysis result for SHA-256 a097397a3022d4d2…

MALICIOUS

PDF

88.4 KB Created: 2021-08-26 03:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 088c89e6ca4a438d34268a7867a71a9e SHA-1: d7a2b0f62fe4bfe79bcec16f7b2f68455a7bad6e SHA-256: a097397a3022d4d2ed026b2d4a5cbb6a485e81d3341d06a1d4fff7eb4fab8a28
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 PDF files hosted on external websites. Heuristics indicate these are link farms, with some hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing sites.

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://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/69a19ce6a2e8714a8435f8eadb6fb247/gegumenewenetutinoja.pdf In PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/wujituvidotel.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/16235682511.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e36c5c4471a---95352924672.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/olsgktgthlgfor5an9rkaahou6/73072099023.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/wofajofazukepofotimifezaz.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/6bu3sd7frbm4bmm1sa99mbkduu/rokegedewobamuxerabasenok.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202108152337509475.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/047d26a9ffac9dcdab7db18a664b3555/3717808680.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f2748d88564---64193915659.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/xudutowesexo.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/jexituzuwexina.pdfIn PDF document text
    • http://agavietnam.com/img/files/nodabebamiruxisedafikipa.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607555bca6942---78415417173.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/lagetikagotujole.pdfIn PDF document text
    • https://airshow-bg.com/file/26651292237.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/45610010438.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/69222482160.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/jikubosewaj.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/vesolegewe.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/4287bd542ba663dd453fdfce8283fb76/fimisufarulazadowuvox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=condolence+message+on+death+of+sisterPDF 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_off0000f9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001120a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120A 10956 bytes
SHA-256: c43a9dcaeee7042c46f28f70c1827d220ecce63244c1961f2d5ab26a20d7c8d9
font_02_sfnt_off00012b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B09 15848 bytes
SHA-256: e1618bc59cf1f9a983197424367500485ef4be8c0153a5c1dbc5ca3266394fad