Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e42a178bbb76a6…

MALICIOUS

PDF

71.5 KB Created: 2021-08-28 04:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4f37aa9d75f197db1c7782637d4d89f5 SHA-1: d92d83387bcb0c7e25da0294ddb0ebf5d5768d8d SHA-256: 97e42a178bbb76a610d820948ff384d9ef803e7586e8b0f2339ea0bf9770f7d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS uploads, further supports a malicious intent. The ClamAV detection and ML classifier strongly indicate this PDF is malicious, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://dep14kirov.ru/userfiles/file/82553387639.pdf In PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/95955231543.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/watuva.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/do83cqrconlcr5k5g9stba9ngp/7202576447.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a366027f042---35407524322.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/zivirowudediti.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/14693002635.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/5th6d39fle6ibjn9arhjrq7g5n/88058124499.pdfIn PDF document text
    • https://soechi.com/userfiles/file/77079934472.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/04ab3355be9e287d0242a291b2c2b399/dozokugi.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/79216204705.pdfIn PDF document text
    • http://i-physiology.ru/upload/finanawakigek.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/92a48f261ir7g61i1kfi5kn540/kevuzozulonefefesesuxago.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/73914590796.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ff9e9gatmsbom0pfngicr5efdl/598388804.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/30816536695.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/nefugujodexup.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce02f1c0033.pdfIn PDF document text
    • http://4bx.pl/public/file/50507496032.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/65244088925.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/84162920028.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/niraxivanigovajane.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/60917440468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=normal+heart+rate+for+6+year+old+malePDF 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_off0000b946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB946 15272 bytes
SHA-256: 4fb7c600b102e96fc81eb82f46013aa47ab7fbddedf3ac72ec375dfc93bee652
font_01_sfnt_off0000e048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE048 10512 bytes
SHA-256: 9eb2c7c9c881a61cb9a38c7a5a422b1ff89fc17b69885107054ae1c50d332aa9
font_02_sfnt_off0000f84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.