Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de95a89bb4df759…

MALICIOUS

PDF

84.0 KB Created: 2021-08-15 21:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 88940a5c8f4843555fa24ad6d8d56e98 SHA-1: f1f153d50d7f495c8c31e673339d7e631b2ca8a4 SHA-256: 3de95a89bb4df75993f485c0377ef06e7ecf309e36e8f7dabd94dfe03783f53e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://harchovyk.com/userfiles/file/83375401928.pdf In PDF document text
    • https://volnynaklad.cz/data/file/rituguzajisidage.pdfIn PDF document text
    • http://nothingelsematters.net/pharma/images/files/13869083785.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/sitaguxosegojularo.pdfIn PDF document text
    • http://redtopmarina.com/clients/7/72/7297c65379f6126c97b8b18e62fd1dd4/File/musebifazilebexezoga.pdfIn PDF document text
    • https://tomas-music.com/contents//files/4298782821.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30fbbb59e0---zegukisepotomejupe.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/gavokoriv.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/46d3d3b8c53778afdee1afbd97b0a06c/jazus.pdfIn PDF document text
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/sojageleri.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/dde64668793e80e9b6c4705b5cff24da/89290331793.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/a26bfc686e6f7222642cc0d53a682e80/56975206968.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/4e17a9c22f2b835d4953e4f45a8c2856/4083610521.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/83701229595.pdfIn PDF document text
    • http://orem.mn/uploads/files/34531455684.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e54909eb5f---92178324637.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/4628523304.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf7b97de2b---98307412453.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/pupidinepolegusajixa.pdfIn PDF document text
    • http://22743333.com/userfiles/files/22866989865.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2vqlats3pog254509do9p1mbi6/lelipenejuzapal.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/24019446052.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/jamojametirebubida.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/76a968c52b01609a2f0ab067d996b86b/49844274002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=converter+pdf+em+word+edit%C3%A1vel+gr%C3%A1tis+onlinePDF 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_off0000e188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE188 11040 bytes
SHA-256: 8519a7335b90b00aba88630a5c9af1a2d623378d989e482fe592a01aeebf7e4c
font_01_sfnt_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 17060 bytes
SHA-256: 17cca67263b8434bbcc178b062044903d28ca1bcaa062bf55e443cb68894b8f0
font_02_sfnt_off00012724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1