Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5657d058822cb5…

MALICIOUS

PDF

72.5 KB Created: 2021-10-01 04:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e351b048cd8bd406f0043b65f743cfd3 SHA-1: 19bda89c4cb2cfc4f6de491837a408435772051f SHA-256: 9f5657d058822cb53699d7bd771151e235967fc97fe8f160fb66415e714067e6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content. The presence of embedded URLs and the 'QR-code redirect lure' heuristic indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f48444d9f5---labuno.pdf
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/xufugiduvodufuripa.pdf
    • http://ventmetal.ru/userfiles/files/92013343941.pdf
    • https://mallarpurnaisuva.org/go/file/83119674938.pdf
    • http://www.hgbehringer.de/img/files/files/sodudujisawifepirup.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/hpn0uha4tk4do6fi1m8e1fkjj0/mejupilogudebo.pdf
    • https://etevent.itweald.com/uploads/files/61493efad659a.pdf
    • http://jysfh.com/upload_fck/file/2021-10-1/20211001001125893675.pdf
    • http://ohappy.org/userData/board/file/javizerufexesele.pdf
    • http://www.mustwalge.ee/data/content/files/zekamumipimujuzijodafepo.pdf
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/84246503661.pdf
    • https://namdolove.com/FileData/ckfinder/files/20210905_15F5C47DF9C525AA.pdf
    • http://pijntherapie.be/uploads/files/vujavabuv.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/f6ff930c66155b4126bceff9d0648f67/dukujesalidonifi.pdf
    • http://ghalemdi.com/userfiles/file/2130933729.pdf
    • http://clinicaveterinariaalbese.eu/userfiles/files/vivovirunisigex.pdf
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/33734370722.pdf
    • https://dragonexpressml.com/userfiles/files/52948797673.pdf
    • http://skene.es/userfiles/file/92018712617.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/41895d0f5029777d3a3bc729d29d4bb4/85557020343.pdf
    • https://confetti-seasons.ru/upload/files/bisubetiwefazez.pdf
    • https://lasanisports.com/files/50088424661.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/l520i5vbgpga37pfbp0141slj1/92587532995.pdf
    • http://sanyosushiglendora.com/uploads/files/zunexogukozorirakum.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=wifi+qr+code+scanner+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3ab.bin
96fa94b3958e47b60e9069f88ea2b0562add759a94a6fac26c056bc55434cf54
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AB 10700 bytes
font_01_sfnt_off0000cc21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC21 16792 bytes
font_02_sfnt_off0000e433.bin
6564923b187ed307e8b7811376bcbaee2f3c226a708df71833b8b04c6c8d1217
pdf-font-stream PDF embedded font (sfnt) at offset 0xE433 19012 bytes