Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ba17baee614dad…

MALICIOUS

PDF

96.8 KB Created: 2021-09-24 02:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5df8e6fb1db631949b270dde9d35cfb8 SHA-1: adc756bd4be53aedc1b72530f99e99db8e413e9c SHA-256: f6ba17baee614dad506fe6e58b97b0d4c52f4ddd8e987caaa4b556462c0faebc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://paykaaluminiya.ru/ckfinder/userfiles/files/diwuvoruladelaxixinik.pdf In PDF document text
    • https://sportsht.com/userfiles/file/51132867723.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161451a790e230---48064476908.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ja6t9ot1pcfr2jb50bt1sl13v3/94908965298.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/maxupef.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1af6170e0482a10f8a8431ec63aaedc7/21005326001.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210909081503.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/11259010367.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/goxemesol.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/ponobajidonapefemidid.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/koxid.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/povilezadojixurujufa.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/kegarox.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/47315945534.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/zoxizipijamuwofarumekagod.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/zozona.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/wejivex.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/47766711736.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/9007183793.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/61334372261.pdfIn PDF document text
    • http://pneusmarene.it/images/file/nepisinenaputusoxa.pdfIn PDF document text
    • http://faradbox.pl/files/file/jerevuzenosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=howl%27s+moving+castle+art+book+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_01_sfnt_off00010015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10015 22444 bytes
SHA-256: 0e326c795881427b2d43303ba4ff65ac80ce5ffec8846b109011b6e2c30041c5
font_02_sfnt_off000139a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A3 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_03_sfnt_off0001422d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00015a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A44 11372 bytes
SHA-256: 8e1247e9ce424296fe40de8e2745880428f04f82f6cb0abe6d030fabcdb3137e