Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3e28f95c00607c…

MALICIOUS

PDF

86.6 KB Created: 2021-09-17 05:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8cf0d5656a419d565546908a3ebb541 SHA-1: 64c35453e788f063cc629452fe59251767f9231b SHA-256: 8a3e28f95c00607c473a446f1449db807ec099808f2fdf24236f4b4366a152b4
216 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, impersonating cloud document services to trick users into opening it. The presence of numerous links to potentially compromised or disposable hosting sites, coupled with high ML and ClamAV detection scores, strongly indicates malicious intent. The primary attack vector appears to be social engineering via a malicious attachment, leading to exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://avvocatogiuliani.it/userfiles/files/30012496719.pdf In PDF document text
    • https://o-dance.com/upload/files/zuwajezugejepo.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161394747cf89c---jikikito.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/84443457757.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/79848086860.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613edcd6cf432---luliribagisilagu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161306ff082190---28007663168.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/75277616463.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/dfb4844b9e39f751660a3616561ff9c5/64751151074.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///13556606526.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/fanopafun.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/66403398920.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/dejeruradirixejupab.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/40116093172.pdfIn PDF document text
    • http://art-ball.net/files/file/8418666962.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/xuwofezazumukaj.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/544dcf7689d45c72aba2d6cd17559e37/14867661170.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109031456236659.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/6oql7h23adgosop6j2170tol8c/11408829186.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/90836314844.pdfIn PDF document text
    • http://kalikraft.com/images/file/63940382329.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/dewamejesobujujifo.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/44131315563.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e6f63de12---zabitovokelarojo.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/mogekimebekubukivabov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+tablet+connected+but+no+internetPDF 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_off0000edb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 10416 bytes
SHA-256: 18f14f180a13711e1cb09f04336dfa0dd3bfb1e87641dc9211c88a1d1d829c01
font_01_sfnt_off00010560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D72 18092 bytes
SHA-256: ae9a907f4c528069000529ebabec0f451ae466d55fdf1d9def439a2e97ebd22f