Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed8a69fe73f0638…

MALICIOUS

PDF

72.3 KB Created: 2021-09-03 19:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 59d98733dd798910379a74e7d325745f SHA-1: 72cbb200db2d5d025986389b36d980c570f9a117 SHA-256: 5ed8a69fe73f0638c63d6995457d2a0d7ad73420ec3c024ca8d10fe1753fadb9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains flagged as compromised or disposable, suggesting a link farm designed to redirect users to malicious sites. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gyarmatilovastorna.hu/userfiles/file/38330845389.pdf In PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • http://magicdiscoradio.hu/userfiles/file/34279820059.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e97c62642c072e8211b91bc65e934aa8/xinozosobopotozuba.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/gumimuguguwij.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/87578b48c71286cd1fa52639ae0fb6b8/bamavuv.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/kabalipap.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/42606017861.pdfIn PDF document text
    • https://jin-ji.com/upload/files/puxebilosigasugu.pdfIn PDF document text
    • http://blueyee.com/upload/file/1407425224.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/50109654804.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f403ee6e584---34808352461.pdfIn PDF document text
    • https://medius.sk/userfiles/file/rivanebolejele.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/79241556099.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/xukifanojeloralevavuwaz.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/360235b017695f8f7af6c274a4998a6a/71750090796.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210822003656.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/weselalafironanorudu.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/nedugatu.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/69683983060.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/20338333377.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/93117739336.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2d715dd5d9b5cfe335176b3dde608612/fulolasusifasa.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/18793990791.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/35828221111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=manufacturing+technology+2+important+questions+pdfPDF 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_off0000b54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54B 16780 bytes
SHA-256: ce69f36c95d49ded7f6c43d50aba9302775c6ad401ca27b07be80c11c2089f97
font_01_sfnt_off0000e076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE076 11540 bytes
SHA-256: 7fa665c2cdd47b40b60be125dde12ae071c496efe2466a2546b16e14b030ebb6
font_02_sfnt_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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