Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fc166d1eab671e…

MALICIOUS

PDF

159.4 KB Created: 2021-07-28 03:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b0beb09e6341b438a0823060fc101905 SHA-1: 57458b0abdc45f321f41a404593bbba4360da42f SHA-256: e8fc166d1eab671e364200ea89c4f2566767ee1627393d99017e01ca584a6951
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs that point to external sites, some of which are hosted on compromised WordPress installations. The primary goal appears to be directing users to potentially malicious content or further stages of an attack through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9478

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 https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/df392109e94dfade13ec2cb3e8e451bb/65599634227.pdf In PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2311dfe6---jorivakilalatasejofaxi.pdfIn PDF document text
    • http://mesterek.net/tmp/fasofa.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/70901189765.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/61684430209.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/5507812731.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/9233919526.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc6c50e344---refopofevunerotagi.pdfIn PDF document text
    • http://reunionclass.com/clients/7469/File/vipumiponufaniz.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d59b2ea5ef20367d000f0ba0a29f1537/wezenujevufu.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dca552515---96501901430.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/begexaxopojavezos.pdfIn PDF document text
    • http://xtra360.net/campannas/file/70663407616.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/mvgcjqmtssj230qt20ps2qaq1c/98325666691.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/nozibakufemetefal.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/99709743725.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/77406729946.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6875f2c1a---61961923136.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fc47b3e9a---zomovev.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/33266487021.pdfIn PDF document text
    • http://pasted-radio.de/web/files/buloziwupi.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f6f8adc1---16737238700.pdfIn PDF document text
    • https://sce.tw/uploads/files/60c4e85d669ea.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210503191522176.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607234068633b---rovuligexibodekotof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=2020+impala+brochure+pdfPDF 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_off000209b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x209B9 10900 bytes
SHA-256: 8d0dc8f6544c8a043f0e3d22472b907f77630da7b96189cde217688e31ad9417
font_01_sfnt_off0002229f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2229F 19292 bytes
SHA-256: 30e7d37e9a0dffcedd48d5e9b0581de2f3f486806816841fbfb460ee2c89dc54
font_02_sfnt_off000255da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x255DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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