Malicious PDF — malware analysis report

Static analysis result for SHA-256 562aebf89953712f…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 03:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 513944f72e665f00e8a870c6b7759ce3 SHA-1: d54fdb7bdcf283f508474682192a4d346131117b SHA-256: 562aebf89953712f75d19a703fbae723465073c8ec13bccd11d11594c76374ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous external URIs pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://irlanc.ru/uplcv?utm_term=pickaxe+generator+fortnite PDF link annotation
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16137a3017f363---55709264555.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/92616143213.pdfIn PDF document text
    • http://vitrine-prof.com/files/konefizegotifuduxebodo.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/61809014755.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/9250258930.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/44392373472.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16135281e0254b---bafufabusobebenite.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/jatazaxa.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/ganuwodoxeleva.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/gezazipixinebutinexelo.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/97521266140.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/vefopataxama.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/4ffddbe4bf442990a2a88dacafd60fd0/28030345151.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/e2f5b719222a310facb444c38f8030fe/pevikumewiwoniw.pdfIn PDF document text
    • http://kezheng.net/Upload/file/49185947627.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/26173865487.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/muvuxu.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210902033351.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee1c03f12d---66039684509.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/movas.pdfIn PDF document text
    • http://cycling-software.com/files/file/rusobusut.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/6655530900.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_off0000b20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20E 10492 bytes
SHA-256: 8881010599cfb60acbc666aacdcd57f3f3c902ce115ad93934c561dc3be49034
font_01_sfnt_off0000ca1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22F 16268 bytes
SHA-256: c479d1fc559607d83eec4790c1a5834d7a927b238c8602bf1e05bb2e27e16838