Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8aedecb0c4e800f…

MALICIOUS

PDF

79.1 KB Created: 2021-08-26 05:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2f3a5b6a8580fe05ddb28ac471bc8b7 SHA-1: bd55ba18bb69e0a0e0fbe5e5379cbb86e82a8661 SHA-256: a8aedecb0c4e800fd132211fee82c7980550c6ff8a9d638b630a0e45cbe19c23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to multiple URLs, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to further malicious content. The presence of numerous links on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff495a3abe---zatidejosisuzotuwifaxumun.pdf In PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ir8hdrb4d93lb1bp17suoup56b/73399516984.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/lisudabusa.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/segusepepajegufixiful.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/53343439990.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c641d302183---loxojumi.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/34307626272.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/fifuvumo.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/b5d577e52eb9f11180497b24e48018e6/31300765179.pdfIn PDF document text
    • http://industrialdevices.in/uploads/41778083307.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/34267811358.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/kolilepututi.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/6ak6nkep2pmrt2fls2mq1m5ens/20023088747.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/funabemujajorowadesi.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/wuvuvugasotoxovabuti.pdfIn PDF document text
    • http://banquat.com/userfiles/files/dinetu.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/52478129759.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/xonezokerag.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/25264218238.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/2fe5ad9eef5587562bce12016f869f86/41353395519.pdfIn PDF document text
    • https://icbacademy.com/upload/files/9585343060.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/73782722017.pdfIn PDF document text
    • http://373113.linker.tw/files/16440861996.pdfIn PDF document text
    • http://shosholoza.de/file/tabagetapup.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/70596718113.pdfIn PDF document text
    • http://climtech.com/files/files/75950974613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=math+addition+with+regroupingPDF 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_off0000d0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A5 10636 bytes
SHA-256: d09ee6c66098bdd1b915476ad1f0cd581ad54aac3f90b73ebebf1bd26776aba3
font_01_sfnt_off0000e8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D1 17116 bytes
SHA-256: 55762f15240a95e4a89352ea858e526c24fe871b14986513a94ee4993dd7e349