Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b6eb5447d0a094…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 10:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e3c520685aa5aaa055be614a2ce6df1d SHA-1: ad708da78f036391974fa0ebd221507ee6405cdf SHA-256: 83b6eb5447d0a094cedf05a73180122c428084f61c85eb7535f96c4f2d3ad4f0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://onsijsselstein.nl/userfiles/files/17063622533.pdf In PDF document text
    • http://adria-ex.com/images/blog//file/folifiw.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/gakigomozabe.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/17265076506.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/l1cilujk2ipvs9vg9slid66a48/vixajokowamumazasutesik.pdfIn PDF document text
    • https://drlanda.hu/user/file/63722447986.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/kidatapuwisadururaturo.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080e93d07d20---kadagefinuvabi.pdfIn PDF document text
    • https://somogyplusz.hu/files/kanokifosaxugavi.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/tomekusulufukel.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/0b2fc64ac383c7ce8013d96965893b72/xigeniduvogefevaweb.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/b5fccf02f1d86b1aa56636c03834cf04/41666146585.pdfIn PDF document text
    • http://ezibra.pl/upload//file/93747222968.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/90419bceb8744b4cc5c7d8a3b4b53b54/zuwaxunimavegidir.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/89e1a7e602aecf0a6f26b7a60d1c0956/14010586339.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3cc60450---95225789832.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/22307d392f7224805e7edda2ef83db02/36366685937.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/nuzapojefafujugesapoxove.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/gevovavojez.pdfIn PDF document text
    • http://abwva.com/uploads/files/3026765719.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089b25f44dbd---70003331688.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/23506353818.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/8f08ofqhnfdlapl2odvmj35pet/60855573129.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/99921376924.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/60887534846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=three+digit+subtraction+word+problems+with+regrouping+worksheetsPDF 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_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF4 11344 bytes
SHA-256: a90b522a6fc4c3bd705736a081fdb5a63731c54816f342ff85f1e1d659bf1bad
font_02_sfnt_off00011511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11511 15516 bytes
SHA-256: a33d64a8796af15bbebb82a9bffb42719430543acc59fcbaaa4f7df79e2798e1

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