Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36ff08ec4597dd5…

MALICIOUS

PDF

72.4 KB Created: 2021-09-12 19:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b20ad3788af0503150249089791e1d9f SHA-1: 06374836a2ad4a48d48e110f2c6b92ada4ef9092 SHA-256: e36ff08ec4597dd55f7dc44f5088dd4a171496d49ee5f7e9d4d5c0e8c77d7b08
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable or compromised domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings and numerous unknown URLs are strong indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://podhoru.cz/userfiles/file/36282534273.pdf In PDF document text
    • http://natpuedu.in/userfiles/file/jazitakopifajalizofesum.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/54461180034.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/69064666799.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/52407830753.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/gevoxulanijikidujexesin.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/moxaruridafuzib.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/87826231358.pdfIn PDF document text
    • https://digicpictures.com/downloads/paruzala.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/75751762713.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/84180256490.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/gojopozuj.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdab370b5c---91652462995.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161360e2ad4a1a---78725353912.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/fifujomuwam.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/14040460094.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/rikiguzabexuto.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/pojoniza.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/fudopetiguk.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/29068933128.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/masigedofevabo.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/veter.pdfIn PDF document text
    • https://sambelteri.com/contents/files/66677634274.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349c613d290---kexekolatasuvolijajabe.pdfIn PDF document text
    • http://hanleyresources.com/images/44265813352.pdfIn PDF document text
    • http://mobitransjogja.com/files/9626136641.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/34310851651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=another+word+for+i+agree+with+youPDF 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_off0000bb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2E 10700 bytes
SHA-256: f335c71d70771916b048ba85f1c9eb4d798a4d8c15108397f233f7c1d48be190
font_01_sfnt_off0000d391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 15924 bytes
SHA-256: 232bc41b1a2594455cfb1006409f0f62a7e65007a55f732fe8f82f142a29b1cc

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