Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff55b12e948e6c7…

MALICIOUS

PDF

73.2 KB Created: 2021-09-01 04:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: df5da109480c2f554b1ed100032e4c12 SHA-1: 16861dc00385c645e49585e1092d395e089e54b9 SHA-256: cff55b12e948e6c72d3243b14a97df31a65a52ed3bc49f8a4d664de5924dd5da
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The PDF structure itself appears to be a lure, leveraging external links for its malicious payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://otvorene-srdce.sk/userfiles/file/22213661353.pdf In PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/pebawebibatazowuvarifoda.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/685b4d81f9cd773a0b022fb37602496e/nitikinesowibipiparolo.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/46532805640.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076006c62fe6---nodurejotezitapa.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/r4uqp2omm68vu34p64rkqhiafp/52450472584.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40b298025f---81515590101.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/wudifiboga.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/15604027066.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/jojufoza.pdfIn PDF document text
    • http://flexicourse.cz/res/file/zejuni.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/40294794405.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/80336433173.pdfIn PDF document text
    • http://ipceurope.com/assets/file/pebojuwegaxumaxivojo.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/78400345707.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896cdf2f54d---tamumumovatifilapevesem.pdfIn PDF document text
    • http://hangquangauto.com/files/kutowasutu.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106201132544939.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bb7a4147c---84516534259.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/a040cbe2a1a073fb92bc4e5f3a7ee4b5/lolegapenabudopodo.pdfIn PDF document text
    • http://bastola.org/userfiles/file/sarijabososamuvisekotovuf.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c162f397525---64585851449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=racial+justice+quotesPDF 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_off0000bd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD72 10440 bytes
SHA-256: 39943087208457cd2c34c5ce75f68f0a160ca05886d370ae8096fd2f52b445e0
font_01_sfnt_off0000d546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 15652 bytes
SHA-256: 1ebced6063189655d22f870593f5fddbae5f82d48c8965218262f16b3da02923

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