Malicious PDF — malware analysis report

Static analysis result for SHA-256 26cabeb207e9d1ec…

MALICIOUS

PDF

84.4 KB Created: 2021-07-06 05:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1b66b58afcc75c01ae825458816c76ec SHA-1: bc2baa3c11fc6648d34fe81e3c4575f16d4dd324 SHA-256: 26cabeb207e9d1ec9e53577328eb54ca8ffc3f3cf24b537af97480bbf66590fd
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://naturallabs.fr/userfiles/file/16717336141.pdf In PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/gutume.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a8a5f431ec23f199e8aa5d9b3d7e4de8/noderesegewelogol.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/24312628788.pdfIn PDF document text
    • https://maisonforville.be/documents/file/siputise.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783253676fa---18517719890.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2afa17b7dc---68190587601.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/84638394893.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/7742570a284f3988fc936db7243c9b95/talomudefezanoli.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/70759594689.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/35280428056.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/gpamdpal97564katqc4avv7mo3/mabaxagetozapur.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/99361784175.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c9c4668bdb69237cc2e98291b8b37723/50745880229.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10cf0e034---kelerifotizev.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n8n4kvdb99c8rviof86c0djds2/kimenovexewojesebuzeje.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/75030432258.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/bkoc6mdhr962j8ckjvf2ohlc5f/40034396876.pdfIn PDF document text
    • http://vinmexindia.com/uploads/tegubixugixilijabakimadog.pdfIn PDF document text
    • https://lasanisports.com/files/guxotot.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eddef0537---vudefurosomurozoru.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/zobubufatapom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=butter+tarts+with+vinegarPDF 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_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 16748 bytes
SHA-256: ecdda60cf712b6d55637d1ad32433df6f7cca16d88b1c08e8869d29cc5e84a2a
font_01_sfnt_off000112db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF2 10524 bytes
SHA-256: f3f674e4fd5f672f8fdf98fdd0196f2938ee1dc949bfb9533796111fc5ceb878

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