Malicious PDF — malware analysis report

Static analysis result for SHA-256 48600cff67afe8af…

MALICIOUS

PDF

76.1 KB Created: 2021-09-06 21:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e44c8bf5cd37ffdfa84b3d57bcfa5409 SHA-1: bc15a674a505571669bfbba868635c14c8b80b3f SHA-256: 48600cff67afe8af98d5a3eca1ada38d5dd57ce047576841b529d5dd4b073ea9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple embedded URLs pointing to potentially compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://elverum-revmatiker.no/images/file/sozegirofefopar.pdf In PDF document text
    • http://inarchengineering.it/userfiles/files/95597923981.pdfIn PDF document text
    • https://zhansq.cn/upload/file/75062111270.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/90335685928.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/52727993873.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19b2443df9---mibukut.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/pubulunaku.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/ratunekofarosatuxupasosa.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a7381067---dujivum.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4e2e9630d19ee861df008ef1c0bcdcc4/zuwinapiwikelete.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad639f8dde9---lidipuxifesixoverud.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/25524706525.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qt1eege3nbsul3bgvnkulk4meg/53141141770.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/vewemolubiwokiziposupamit.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/faluj.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075b75f3e2f8---zedasiluxirelufomekidid.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/rezabugebesozuxogu.pdfIn PDF document text
    • https://norservis.cz/files/files/vumojezebux.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/86316755704.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/dofimaremirenajurorofopul.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/tapol.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/72a862afe112ee883760766996dc5bb4/lasosavu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faed07fcdc---29939128926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=psicologia+una+introduccion+scott+lilienfeld+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_off0000c308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC308 17720 bytes
SHA-256: 92ffbf6975dc4fd0a168dfd16a42ed63962eb1d8242af6d3f0959266f01ce81e
font_01_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 10896 bytes
SHA-256: e2c26e7844cb36d37353460e0ef940dcb6bee3bb8355d4def4c8249baeac7c27
font_02_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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