Malicious PDF — malware analysis report

Static analysis result for SHA-256 1feb1a508b50e7fe…

MALICIOUS

PDF

88.6 KB Created: 2021-07-03 21:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d72795c74f1f1b9621ec2b3b3b7f4260 SHA-1: 73475a846fe1d1201cebdeafb1ddd912030762a0 SHA-256: 1feb1a508b50e7fe332cc37c5a4fd5c59ead29153e683a470a23733dfc9bb0b8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters further support this phishing-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16070327fd705f---64809584133.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/6sadg0k0n7atppge100t0ibqv2/fulerovemixefejutobem.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/pajatukegogigefamipiz.pdf
    • http://ash-graphy.com/userfiles/file/fogenolob.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/dk38fbb8jshocv4kmivhfkqru7/buxogawal.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/34fb1a3d9800ea8ba2eb4f54281235e2/duwotogofubuwenowefivofax.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/aeb7976a6c276c91d1726a43f4fb2d18/80540960254.pdf
    • https://tylbm.com/Upload/ckeditor/files/58736065752.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/34cd42ced6cabcee981f53e1dd8ee47e/52865455895.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/66b1962b39b8745445f8aeec690f09ab/47090175115.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd374048cd---773524364.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a49a95b36---pilububuwizifabatowarokiv.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/f0fd836d54e02259e2a7119d450d2a3e/24414060033.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/11866936636.pdf
    • http://skupka54.ru/upload/m/82728221064.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/554894f55983ca72d196349249c54c99/pofaxojazumobijodigugudiw.pdf
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f531f6bc1a---mujonisawonipivuremi.pdf
    • http://ajisushionline.com/uploads/files/wimavevikikezabupa.pdf
    • https://pui-vital.ro/msg_media/file/jarovol.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889ef50b9bd---suvadufudinemikozefix.pdf
    • http://boeschfamilytravels.com/clients/43210/File/22086975748.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b613efe7293---xitididuvajoto.pdf
    • http://traiteur-ribot.fr/userfiles/file/16483503860.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607807635f7e6---pagataxivirajunazapi.pdf
    • http://ventilatoryzlin.cz/images/file/vigovakula.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/1c7tehiosm9f4edhhj5j8bmtgc/78203976653.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=t+cell+progenitor
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f831.bin
4b3a0654de4e939d472cacae30c41ab3e1876328da5d70002bb427128c133301		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 17100 bytes
font_01_sfnt_off00012507.bin
b36b82c914784f97b91294f98bdc5d2d17ef4564cc510ab3f400567a90fc24f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12507 10180 bytes
font_02_sfnt_off00013bec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEC 16792 bytes

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