Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be865d96f1785b1…

MALICIOUS

PDF

96.9 KB Created: 2021-09-01 12:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8159cdeab27f020484a05a6e96a10f9d SHA-1: 3a3c18a19be7000ba702618b911df3e5b4ae8059 SHA-256: 9be865d96f1785b1a5ed599fa3286ce968af9708e974e2b852882a90ac2eaddf
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 compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://betentour.com/sites/default/files/file/narumamexu.pdf In PDF document text
    • http://b2cexpressdemo.com/userfiles/file/76942125735.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071a3fc0ac04---sawisogafimiwivajujasuv.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/29685624991.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/jajugob.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a96093c255b---45154237526.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/jibabeto.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/lilorofadazifewajegapex.pdfIn PDF document text
    • https://zold-kommando.hu/files/noxevisaxoz.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6e5ff089b7a46990eb3e90f193004cd7/tonovimopo.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/10007868590.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c13c88b307c---88654647367.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/bilifunebaxuruwef.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/zalegedenisipev.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/84938058542.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/41628625707.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f1a2ece3e---64829650225.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19915300179.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6d8uq2fm1ugtov83olnenucuq5/wefideketejep.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/83854555251.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/hu8389vl62qa0pbdp09ql8qllj/vewesivazipoleruwopejofit.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/rajojodun.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/5794ba1543522846a05bc519a1e62e19/72711513500.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a76be511ea5a07e44e3c3fb7224f325c/mujenupepak.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/rusireregekiwalafenedaluf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=watcher+in+the+water+lord+of+the+ringsPDF 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_off000113a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A3 10836 bytes
SHA-256: f8338f971e22136130be05847a75eb70ab942674754b2d61abe28f4c595546e0
font_01_sfnt_off00012c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C72 18872 bytes
SHA-256: 4b27a941f8433e50c6cd5ab78c94158df0fa328aa410c87054ac867f6e22ffe3
font_02_sfnt_off00015dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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