Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f36518d6fd2eb6…

MALICIOUS

PDF

80.0 KB Created: 2021-10-05 13:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6c42ac5e0cfa1cf10852b80544506e0f SHA-1: c18a52bd53b554b7d263698419b7892d7996b915 SHA-256: 98f36518d6fd2eb60e45701eddeb5c8bb568a731bb3d5d540d26fac7b71b9d6e
164 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other unknown domains, suggesting a phishing or malware distribution lure. The presence of a 'download button' heuristic further supports the attack pattern of tricking users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415e436fc81---65732921272.pdf In PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1632305997.pdfIn PDF document text
    • http://presupuestos.pavysan-bigmat.es/ckfinder/userfiles/files/17344802764.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/jaluzafokovitos.pdfIn PDF document text
    • http://es-iyashinomori.net/yamituki-n/uploads/files/magivomisomiruwefisatameb.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109192002301710.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/kuvisurekapaz.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/68161081989.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210909012511.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/25982281701.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/51951989523.pdfIn PDF document text
    • https://webmenuplus.com/images/file/18853798741.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153c1ddb6725---49665113808.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161428bbbc3283---fomogofimomukoti.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/pefekiwopov.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/zibazazakakezidozet.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/5698167374.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/5028896804.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/kukuvowok.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/7655469738.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/duvefupokejarituluzo.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/fazusidawojago.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/25434109028.pdfIn PDF document text
    • http://ergakiland.ru/files/files/muxagod.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/25631336602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=conversion+of+pdf+to+excel+onlinePDF 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_off0000d1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 18244 bytes
SHA-256: 74d3b95cd1890540083cfdbe7ff6a934f7a53384f7eefe6332698f2728b51a6b
font_02_sfnt_off000119a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A0 10648 bytes
SHA-256: 81136aa2d72842c0958d108c5817d70e35e92879f47ac8dcc18f2a6928c3bcdf