Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d6ff47bfdac2c2…

MALICIOUS

PDF

77.8 KB Created: 2021-09-12 15:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cac4394241bbecb8c427706f41276d1b SHA-1: 9743204dee8c4bd3a21dc3f5592d72e2a238d8ef SHA-256: f6d6ff47bfdac2c2fffacfc42354d4948908530b5a9e1515fa2b0b800927eb83
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, including those hosted on compromised WordPress installations and disposable domains. The embedded URLs suggest a phishing or malware distribution campaign, leveraging these compromised sites to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xn--m1age8bh.xn--p1ai/files/file/78851850118.pdf In PDF document text
    • http://capitaldanceacademy.com/userfiles/files/dotilunoj.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1e43d9a2a---gopasiware.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/kixoso.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/98329bbbc2fca94028c3a0a799d93337/lutifafifikapitabifowigo.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/14022736921.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/pawupogivelamujepolunafa.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/77002085992.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53883533682.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/96540135317.pdfIn PDF document text
    • http://a-pluset.com/userfiles/73546164242.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/jomewenagukupimew.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133097e403e9---42543538127.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/rajiratoditupe.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370014adccd---48173038491.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/87105322661.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jopojawikuvajodimujunas.pdfIn PDF document text
    • http://space-edge.com/upload/files/tomorugibukigo.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/sowip.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25317220550.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/wokupejofarotozepefer.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/a24e5e54fca39f7102ff363280e01e2e/vesozagoraboseratu.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/zuxekowi.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/mugorasiboxejezuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=hero+fighter+androidPDF 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_off0000cbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FE 10412 bytes
SHA-256: 511c6f1a2f375dff599171cce3cd844711b00caece3cc9daf6ecbe3d3d3efb50
font_02_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 17736 bytes
SHA-256: 213592e5bfa98bee73b02124b1f186875e6c3055d72dfd1e9381dc0e0c603776

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