Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f547299204ffc8…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 11:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41e9d8c773ca8690ca3d94117696f336 SHA-1: 1009adb8b02994a3e405dd704979d7b79cf00e3c SHA-256: 83f547299204ffc8588b83dc6c1cd7b9f3348ebdec8f0dab429861bc31bc457d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple PDF files hosted on compromised websites, indicating a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure suggests a lure document designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://live-net.it/file/rewusowagu.pdf In PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/raxofalemakulo.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/38510651723.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/juxevixevuxapomitaroves.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/lixegofegenud.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/rerosipasuvewemis.pdfIn PDF document text
    • https://iword.de/userfiles/file/puvowuvegijukubixupufiva.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396a79bf7c3---fonifopox.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab9281c110---87700631155.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/fufomogurovijabijul.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/duwopuk.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134e408280e5---xorifiruxox.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/77013348134.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/namexuv.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/72433636333.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dafufoj.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bee9c4fc1d---61551486724.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/8792214530.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/15310212573.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/falaludatugubujigafal.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/guvulo.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364e15419f6---83701406312.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210911023332.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/30342536570.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/nufuvegotofikawokagag.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-3/20210903124450522631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=smd+resistor+footprintPDF 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_off0000d4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E6 10528 bytes
SHA-256: cb1409bddc822b174c0960341901a1a907a3baedf2f5e8346bfe60bad756d17d
font_01_sfnt_off0000eccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 18944 bytes
SHA-256: a098d2daed979ad171400a96f42ff3245a3372381ee9e3ed5fae74d8d22dd163
font_02_sfnt_off00011e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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