Malicious PDF — malware analysis report

Static analysis result for SHA-256 a997f0c4f059a1b8…

MALICIOUS

PDF

101.5 KB Created: 2021-08-17 03:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 6d9660e59f18c06e9189319ca340055f SHA-1: 51ef773a4da3c6a10a657b09d257804d0f6417ff SHA-256: a997f0c4f059a1b8786caeeb67db5e2e508a56aa4c579eaae18be30ca6d781d8
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to websites that appear to be compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection by security tools point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b06b5a7f3---xogixejagisofeviberibeg.pdf In PDF document text
    • http://www.mustwalge.ee/data/content/files/xurulezisub.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/3e499a729b8311e543f54f65207fcddb/zevonoz.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/b6f1c81c2f3d07ad2215a6117cd31967/gasefazexixidozobimapofej.pdfIn PDF document text
    • http://rinsacars.com/files/others/nagugowodizutemoba.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/zazexupajep.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3ca0dafce---39767605593.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///49561928283.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/85012802010.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c9dd996a4b0371f74555c5b61de50708/14681510093.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161181521c7627---42455881071.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/28842b03606ed25d7462fb63deaffe68/wiratuxokotatuzoxisezar.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/fagabenukenab.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ae23f3670---nabizedixawipopileguzifo.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/pizidolivogevedigevob.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/i3e1mdrfqf45edmidh9j163sf7/9099976189.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/19275884898.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/71003146921.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/13672937919.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/a4bu3campapmi7p7ums4rdl96n/vopelax.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160947cc149c30---11278534938.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aff9cfb3175---17301464418.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/jt5ug1amfc9dgiljvjqdh3o6ep/sowurizemefedugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+can+i+call+foodpandaPDF 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_off0001290f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14126 10192 bytes
SHA-256: fc7f82f2d38c0eff27c506c0a924ad0a813133c4bc3b71246f7043212e653fc3
font_02_sfnt_off00015805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15805 17840 bytes
SHA-256: 0ea5d1e2f4f0f1837b4edfd6ca613881628ddcf602d8d6adf40c2c9b392e48ed

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