Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8a947a87a3cc79…

MALICIOUS

PDF

94.4 KB Created: 2021-09-20 17:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 33f3a24d3ac70fda7b4cb5d1563f32a4 SHA-1: fac8ad55f47741a71bca8de16941cbe29f989e90 SHA-256: 7a8a947a87a3cc7922208e51ef440cc616588609431ed87f1f14182560420770
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories 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 via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/selurujogi.pdf In PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/xekijabosixeni.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/43d2368fd48abfe50a52c80964e32e8d/mofasazeviwigazefowuk.pdfIn PDF document text
    • http://synergyproperty.com/images/files/59880348681.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/gapopaxegemugexijali.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16141ba0014f38---zojobo.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/vozawupurabizaxababakura.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/42350150959.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gekonetirozovobidewipomup.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/5532822293.pdfIn PDF document text
    • http://hobbes-group.com/upload/files/gimajululibinobumomes.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/livosisekemu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/03b84cbc671fe6cfc1d3d14807233256/kekuneloduvej.pdfIn PDF document text
    • http://sgpeo.pl/users/file/dubefiwiwuna.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/jowoviwupapotuludimebe.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613627630470b---tisexagasapopamevijulipuw.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/64767044923.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/fuwoxejifuko.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/61980065671.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/zowakajabim.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/fidur.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/37995566105.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/82504044582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=naruto+movie+1PDF 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_off00010fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 17696 bytes
SHA-256: df3b670dd2f8b0e7e2a39f0372314ec9acfa45a8d66ebf6ba7d379e6206817c3
font_02_sfnt_off000155e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E4 10144 bytes
SHA-256: 2f1f4f4ebf0f94bba7158862631c13d0c119439bf7779a7772b2e62140756d32