Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d24f7f603af4bc8…

MALICIOUS

PDF

88.7 KB Created: 2021-08-28 13:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9314fcb7f6c6b2ea771276c3fdf43d0e SHA-1: ddd3fc3ccd38bfa37b61ee5a9958ce886ce5cf30 SHA-256: 6d24f7f603af4bc88c16f145bcef033a74da38a32918befc65e7958fa28a12fc
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. This structure is indicative of a link farm, often used to distribute phishing content or malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2f375cd0a59fdd0050bfb2330cbf3a1d/bunakopavemugupupan.pdf In PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/37fd900462637e23f39fab53bf329280/bibawadiwuduwipigew.pdfIn PDF document text
    • https://la-klamm.org/Files/files/92926000379.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083beb841240---jevazuxegefir.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/s0ar24iuh7i5blgvc0lkon16b3/9686956286.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a87bb1f8a0---nowagerapi.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/5209063996.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/65148476746.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1545f2b895---lalebodovariv.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/pazuzare.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/takafin.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160984eda74661---wepakir.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/35265652886.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/67182591957.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fifizekezevuk.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/idhaojdh1jm770qn6ruiahspjg/zegezunidige.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50ab3dc61b---xabujoperilatagi.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/023beea87e85904d2e0e39f0c2f2e2be/radasivufagimupezoxofa.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/vazuduzawofulimuwusebopol.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/85295420517.pdfIn PDF document text
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/rogebidiwul.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/hk1fetcep6b4dshqlujn5d1ne1/67426107275.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/78709036329.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/88188743314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=computer+organization+and+architecture+exam+questions+and+answers+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/83445705430.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_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 11544 bytes
SHA-256: efb70d648b1aa3001518b2ed9a9d0009241870740d6f35345713d50b2e9859b7
font_01_sfnt_off00010db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 17536 bytes
SHA-256: ea0d9c816527086e6957d355afdc8fb128bfc04cc19d4451147acf881811833e