Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf3b79f22f86966…

MALICIOUS

PDF

75.7 KB Created: 2021-09-20 01:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5095f8dab0898e37555d3bd88de32b49 SHA-1: fc841527c0437ce51e7d9dc682a06b6931702c97 SHA-256: 3cf3b79f22f869668397c4220d6612082a915baf139c78999683445084e8833f
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct hosts for these links, further supporting the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://pistant.ru/uplcv?utm_term=how+to+scroll+to+the+top+of+text+messages+on+android PDF link annotation
    • https://tannhatviet.vn/upload/files/vapus.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/menanagibezipevevubibibid.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/murarozejakiwo.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/fenijogamazewagoki.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140c3cb0cb9f---kurefivuforenirupike.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210911193759433633.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/nafodo.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/96672438398.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/zewuzuvasevuminorupizaza.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/puborirawenebam.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/govaroro.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/lomutisikewane.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/zuniroj.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/47166086250.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/nosikegimawezutugexiko.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xewolinudixupuvujaro.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/6pgjavmgdtt4th1g4925en7srm/24521317523.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/fekakes.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/nizoxepim.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16147ab58845aa---58463572505.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465abda9dea---zugubidajakadavikafij.pdfIn PDF document text
    • http://dogable.de/userfiles/file/muxarodanizazavadatilivo.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613548cb0adfa---68154979644.pdfIn PDF document text
    • 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_off0000c221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA38 11244 bytes
SHA-256: 2a12460f71a742aa784399c04ee2ad854ed3178a4c2ab5cd73431fbccaca96b7
font_02_sfnt_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 17616 bytes
SHA-256: 8abe46a43699d51905b9d67c80afde938e6d539dfa4e7ec3f61ab13c03dd4ae3

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