Malicious PDF — malware analysis report

Static analysis result for SHA-256 760b67fad3923f19…

MALICIOUS

PDF

92.8 KB Created: 2021-07-23 23:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d78fdcdf79a31ddc82fff2a6a2289127 SHA-1: 5895e89389c70b534fa5c4fdbc8b268f32075e54 SHA-256: 760b67fad3923f1937b4caef5d22cd47f6bc3b100250aa973ddc5d2eb92afb20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised websites, likely serving as a lure for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics strongly suggests this document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf887c0b1de---76448724038.pdf In PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e42fde0a8d0107dcada403b5a248849b/23449366532.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/20781192868.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/xogirinavuni.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/gutuk.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a001a639ecc---41211106568.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087639470ee8---lifofosewoxu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/058cc6e114ef8ceebd559598e9b47ec0/78765313099.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/00d71978bfa9cb0f1e6b0bf5b050dd85/68546219276.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/lewofibuxobomin.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/37784725616.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/91133174860.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/98411666022.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/38802279766.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/67150371012.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ff2d85b65d795f2159007be90b4fa2af/77466056295.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/kiwotozixezawol.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/denipojexogof.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/4158216b20cd99b7a0cb00a4b1f4aa3c/2343988646.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071408eac144---63417654231.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/51437685342.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/t3mrhguc1r33h5i53m0dpdnelo/fonobajubamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+target+population+in+research+methodologyPDF 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_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC8 11168 bytes
SHA-256: 0a9a22d0e63b3db2c804091c55dc652c63a91fa96cf9464f05aeb3bc26c6d5c0
font_02_sfnt_off00013885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13885 17056 bytes
SHA-256: 849f9e1afb47f2c7f31823a2ac04c30d3165f99c7d847f0bfe79986c5501e54a

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