Malicious PDF — malware analysis report

Static analysis result for SHA-256 6534ac5dbcd60176…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 22:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c9ee99a2cc43b3bea4c73983b25815d SHA-1: a7c2e232c6041714b5ce1c343f0b09d4c729609a SHA-256: 6534ac5dbcd601765f93574bf4ecc5180c4f52f0f4a661250f5c02e3f8503a25
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The document body was unreadable, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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--aknmedcal-wpbe.com/uploads/file/69043228143.pdf In PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ea210fa41---31364488061.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609db256b0543---zewomapetokamakanota.pdfIn PDF document text
    • https://laps.pl/userfiles/file/lozidazula.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/jodeginujipivebagib.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/84df682433856bda1f9fb1fa5688f9c9/88699093498.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/44683244732.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/5e0i7jn0bvjj1va90ktfcgrfk4/ralakifepopiruwub.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/galawikeguvafuzegimuve.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d1a2e390d9---95436157784.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/85439250650.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/35736214259.pdfIn PDF document text
    • https://centerforsurgery.com/uploads/file/16611230139.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610b80b6390b5---tinikizenen.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/paveguzozodomusal.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac3084b531---xukilidavojoteg.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160765b26c9acc---walejozumuga.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/54732707633.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a398ad3e694---saxojawugenapidasolalod.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cfa4d58fb---60144816808.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/xekuvipuveruturu.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3cb0b68a6---18759710033.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb24e89ada---muzefidigukixuzinidogazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=apeks+xtx200+manualPDF 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_off0000dc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 18656 bytes
SHA-256: 77dea3e4736b95a4e1c7c21876a2c292626a8c5c541117a9e5b0df15d7441bc7
font_02_sfnt_off000124c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C2 10620 bytes
SHA-256: 65484106494f179f376d4a2794801c51a6c2326cb1cc12efebcddfe91081958e

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