Malicious PDF — malware analysis report

Static analysis result for SHA-256 0abe6aa51094dc45…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 01:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6eece6a08694ed6b9e2251aad3a9a7f5 SHA-1: 597fccff26d10e8dde2c1b94e82f89d68e4fa5c8 SHA-256: 0abe6aa51094dc458ffed628550f86ba20e792fcbe329eb9be0256b6537c96e6
164 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=timesaver+speaking+pdf PDF link annotation
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b39453a848---mipusujofanaker.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/29849970155.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/zujibixaxanowimoza.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/db068h3kq976qgari7mmbirbq0/xumilogexomajefuzumexani.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/58928288020.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611418173e6d9---fogexewogofofuxi.pdfIn PDF document text
    • https://bliznacite.com/files/zetisaritiwunow.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/coct73mjlb7q5huom0egk1oqt0/kurujunazopedofo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608138d02b796---zuginipenewuzu.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/6939b38933e8ac860d085b018f389df6/vififigodewotonubaxe.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df00493d52---sawabatamasanedepikaza.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/149a175b7be4787dc72accc9dfec0f59/majefigeg.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/49238709094.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/bovoxol.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/h025p9nq4mc3h46pdlerct36e7/talinazobok.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/gpd52liqb7pifpehrbp7sh6o95/46884756158.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/62017967161.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/82900991927.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/buluwajim.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607671c735734---vozutatukuki.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160730b7ebef8a---86240331060.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/suvap.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78533df062---rutuwerekufog.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/somamutawun.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/80480157333.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/vifogunuvidiserijatuxuvij.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/g8jsubk3782iomo9n3blab7ia0/vorowutiwowagagomubo.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_off0000d170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD170 10700 bytes
SHA-256: 549a1aaa05cb5369517fc0f88f8da9c89bf6d7454eeaaa19ba0cd47f13fbd82f
font_01_sfnt_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 20512 bytes
SHA-256: 260aa93d4a92c524dc65724a429121963ee12af367f63118c9b6d37b05f29f58
font_02_sfnt_off00011d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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