Malicious PDF — malware analysis report

Static analysis result for SHA-256 981ac3692a3db246…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 04:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5da6e0b3c7d7bc141daac454146bf3e8 SHA-1: a472b6c86b850ebc41905347ac0e89904b883bb8 SHA-256: 981ac3692a3db246042d9ee551ce1e0f2617d75b7032f207e046b7c08f044ce7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://italy-ex.com/images/blog/file/kekuzotu.pdf In PDF document text
    • http://sinosteelcode.com/filespath/files/20210910144808.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/96667218463.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/14080788423.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/fawugib.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/94509739472.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/pilinofosowenupo.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f997458e88---siduxiveximuwekujoguv.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/86868782029.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/38224914101.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1af1b1301---makipelaxefowulu.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/gegobawuwadaw.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vexatiragiz.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/sibajujidonimoxogezizoviz.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/jedodenomibuviregis.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/rexasobubozilumubezep.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/lidesexegupe.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/7563767816.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/bituditulukenova.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/e66ssd0hdp5b6ssldpbgl65ns4/tenuziwexeworedawupewu.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/walidajofijakumigaviku.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/80375085612.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/velivol.pdfIn PDF document text
    • https://reniuved.it/file/14550535753.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613003fc01db9---gowemudezim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=anugraheethan+antony+full+movie+watch+online+freePDF 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_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 10964 bytes
SHA-256: 5d8865fec6106e42caa2146c1a05c333649e313c2d782e29e1a73ee0cd37fe37
font_01_sfnt_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E47 18496 bytes
SHA-256: cbcd081808d6705a0bc51f41a304f03a3d518f998af48a0b6621c5725b247a5b

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