Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35477f25d4671c2…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 06:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e0f5f365494867a355f8767bc632fdd8 SHA-1: 3c78e64c2d97984759034a68019fe0740a363cdb SHA-256: f35477f25d4671c2bcdd4898c8a635dd0fe0886b950fb36b3c649ab7768a6f6b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is unreadable, but the heuristics and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/db6fd14fa6dc83fe0ad6a29cee74fab9/tevimumaki.pdf In PDF document text
    • http://cncforginghammer.com/d/files/45207972441.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161410ed0dc4ff---mazuvaniropevezuzozaxubo.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/tetomokafegubazew.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/64095082034.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614356439e9fe---42816368139.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/gozanowowo.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/14608266874.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/mezajisolapugus.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/78380217655.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/33291651352.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434b2fdd65a---xijuwawudijaxozowijijujas.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/zokodukujikepepu.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/vakodapojixezixotiv.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/53151039060.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/tanewazoguziraziwop.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/8086205715.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/tavibubefanedisagu.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614082a55ca8d---wojex.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/7430852197.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/zonumos.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210912014944.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109100535388691.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/xisipebigerivatanavad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=to+what+extent+did+the+reformation+cause+the+peasants+warPDF 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_off0000e0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 18620 bytes
SHA-256: f1ab5bebc9e8e8b3c2a60d1ac4f9c8ce5a958345633622b47c591fc2be80c867
font_01_sfnt_off0001117b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12992 11092 bytes
SHA-256: 6e6bef0c0fe7bfffa56b2fac0eb0f99cc8bf82db8d8f98a74b0a9e2ab04fffca