Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ef7983d02b3cf5…

MALICIOUS

PDF

72.3 KB Created: 2021-08-31 08:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 337fd563920290c811668307226b37f7 SHA-1: 6f7668403a0c383b38de44530bbd3be536813caa SHA-256: 91ef7983d02b3cf57a13f81c209f15eb6deda40000bf439eb8ed886da5a39d39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised websites or disposable hosting, likely to lure users into downloading malware or falling for phishing scams. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=planet+zoo+download+free+full+version PDF link annotation
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/jgduq04tibtjj88hb7597661h4/77861528878.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99687a35f---96200551924.pdfIn PDF document text
    • https://kham.vn/userfiles/file/taxemudinegikitok.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12664240939.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/92762037578.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9a6b2a94b---fabawidupofanujovirimata.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/93005727011.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945fceee5d1---30071811828.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210814_184454.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/98452954862.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1621064791.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/75453546624.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc94108514c---24598085420.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cacb65f0873---jusobilonapi.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/87141973037.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/201359871360e558d82e424.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/gaxupaveranedazugoxag.pdfIn PDF document text
    • http://jfe.hk/userfiles/nefaxe.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac755e0967f---linidi.pdfIn PDF document text
    • http://dges.in/userfiles/file/kivevovegewis.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/83738517135.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210823/files/20210823221604.pdfIn PDF document text
    • https://nevisnews.com/userfiles/rapopexibufabuzijezeki.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/sisawopasomexuduli.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/sevexuniguvagibevig.pdfIn PDF document text
    • 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_off0000bc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC40 10660 bytes
SHA-256: 4cbbaf0397d91c6b0c6fbc7234cc7014e2551d41343ece289bac67073c01d8f1
font_01_sfnt_off0000d4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E9 15044 bytes
SHA-256: fd79456bda49a4b8121b9fb8978d52d7d996dc4cf6eab286a5a8060a15780b4e
font_02_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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