Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7e8ca15cc50a90…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 06:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de59216ca76e9c3597e1dbdb4aec0f61 SHA-1: d2485ad5476d17e302954b252bfcaacccc8a6eee SHA-256: fe7e8ca15cc50a900a2f73ec7af3dda26ab34de47ae3341c2456cf60fb87eaf7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised CMS platforms. The presence of numerous links on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://flemingdecal.com/uploads/assets/file/pesuxumitabakakuxuxajodap.pdf In PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338a6935f43---kelutobuzar.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/bivimumuzutoxuvifigepal.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109030058462640.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-7/20210907015645870075.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402c24c8918---roposeguvikekedimezuki.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/42550511690.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/julejediluwemotejakam.pdfIn PDF document text
    • https://norservis.cz/files/files/tenikofuwux.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/66073799697.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/88280699176.pdfIn PDF document text
    • https://kawanmto.net/contents/files/65403602777.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/fopaw.pdfIn PDF document text
    • http://chikatere.com/Upload/files/85851584704.pdfIn PDF document text
    • https://virker-ikke.dk/files/zirezasugenag.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/luvineji.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/pavuxil.pdfIn PDF document text
    • http://net-work.cz/data/file/tomisisavula.pdfIn PDF document text
    • http://tiquital.com/documentos/file/63869578874.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c08dc76b9---61825530496.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/551430be7909219a78a1dc7bcc066410/femagudugijekiko.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/metexezavovaf.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109102023046886.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/libipanaxuxepenar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=developer+mode+has+already+been+turned+onPDF 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_off0000d4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E5 17636 bytes
SHA-256: 51dca740126f56919b09552d48e96d62f986eb610f5f891e1b5de53627d04c7e
font_01_sfnt_off00010229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 10984 bytes
SHA-256: f78a2ec2eab1b6f6972097ba87e3c82073e1b1fe3af11b30efe3e57e9dcdaebe
font_02_sfnt_off00011b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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