Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a62788796f1570e…

MALICIOUS

PDF

87.0 KB Created: 2021-09-09 00:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 62d6ac6933e296ca65139f1e07736be1 SHA-1: a46592a73b858b9adb68b3fbdd1552116fe0402e SHA-256: 7a62788796f1570ee036c3b7d8ed518f232f9f61051367a6903631e660f8db60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the links and the detection suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://ilexgold.com/app/webroot/files/userfiles/files/19902435243.pdf In PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4ad211786c011338ae99710999a37334/86317002413.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/letekewem.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/47446781892.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/bixoso.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/61728333793.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/74289597694.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/85418639298.pdfIn PDF document text
    • http://congtyvima.com/images/Download/11844239155.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/78639220823.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/jilesujo.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/zizuk.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/81583718006.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///49844180042.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/90954496720.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/4e8c07a86d3a34636668527724442f56/wupupubabe.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/26388389847.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161333676a9e0e---kufow.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132f09e1062b---66390616785.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/bokipedawozatutelofesi.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/tapepezomikebawe.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/lenavuwolekodelujat.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/4469003753.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e1a19219---worazakemuxajilojamura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=identificador+de+chamadas+androidPDF 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_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 20156 bytes
SHA-256: c799c633e972191023cc9f0b49b8f5c749d84bb7fda648f8247b6752cf3db04b
font_01_sfnt_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 10648 bytes
SHA-256: c6ca6af1aa364724d20345ac285c0a72c9cb5135452e80f3a965c742bb98212a
font_02_sfnt_off000135dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1