Malicious PDF — malware analysis report

Static analysis result for SHA-256 1959fb76c9b7c4a9…

MALICIOUS

PDF

91.9 KB Created: 2021-09-12 23:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9463fdc6099130c9b6479658c5957e57 SHA-1: f7de83b3b04109b2a25e5aa5ad891b0edea2d1fd SHA-256: 1959fb76c9b7c4a97586c3801f56b88b0d9529a647f73915f89476c762eb6f8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as a link farm and a potential phishing or malware distribution vector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document contains numerous links, many pointing to potentially compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://jun-travel.com/userfiles/file/84406771504.pdf
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/17758998119.pdf
    • https://wintechindia.in/ckfinder/userfiles/files/28555699563.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/nsobv7cidmhkagjg2463tgssh7/19674398416.pdf
    • http://budaikepkeret.hu/uploads/file/jiwesag.pdf
    • http://0vote.com/ckfinder/files/rakapijo.pdf
    • http://ilkyoukais.com/Images/Media/files/74027992242.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133646819549---26573187425.pdf
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/tugevuzobujegorosames.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f95f5db8b---32059880098.pdf
    • http://89928386.com/uploads/files/202109040527399999.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d279b542ef1927f8f451749268271c42/81903831542.pdf
    • http://0286869143.com/editor_images/files/bediwigixatorivod.pdf
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/venosexanomimez.pdf
    • https://www.puskinas.lt/ckfinder/userfiles/files/46157156218.pdf
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/luvoda.pdf
    • http://kruengrangthai.com/files/files/36201153468.pdf
    • http://surausa.com/uploads/files/73573424591.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/455edeac477eb891a330e27dac1d4bf2/laveputod.pdf
    • http://benthanhsgfarm.net/images/uploads/files/73917429287.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359c48a0437---dixidapedujujenaxur.pdf
    • https://securitydm.rs/slicice/file/29020542298.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/bdb8de052472f4c33b823e77e10b4017/27473758790.pdf
    • http://nut-shell.net/upload/files/pokipivofajexamenivozowe.pdf
    • http://petra-koparki.pl/Upload/file/42110247262.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=saw+3+full+movie+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104f4.bin
06f40fb7c29ccfd3b1b59d71b99c158b85c9ce2a03533afbc53e3580061ebfea
pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 10504 bytes
font_01_sfnt_off00011cf2.bin
3b44d26f19f760769d5d0fa6b2cb4d9f1730e22a679acadc75708372f26cb765
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF2 17440 bytes
font_02_sfnt_off00014a1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1A 16792 bytes