Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b0827373440b32…

MALICIOUS

PDF

83.8 KB Created: 2021-09-09 04:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3d3c275efaa86e95d46d66cb82d6cfe SHA-1: e200d4117b10ae67dcdfaf47cce4c45d1b922e24 SHA-256: 60b0827373440b32285da82d3d656964e9aef435b64b0d765f0124d54420d370
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a link farm pointing to compromised CMS upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/vf3a6sojq8hqvbnti4tq83va5p/35009798017.pdf In PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/67145771320.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/wivowaditilejope.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/konejakaxumed.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/rutelopedojizar.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/xiruximobus.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/49809719902.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/rirapizesa.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/buwiwupedafiwetomoxusip.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/siwikatenajugagudoruke.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/88065262549.pdfIn PDF document text
    • https://diphong.com/uploads/vekob.pdfIn PDF document text
    • https://brs.jo/userfiles/files/2909762826.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/ziwawakonasi.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/85637426111.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/givipogovasasir.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/15917944517.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16138a41312603---wivagosagakerotirileli.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/59862842513.pdfIn PDF document text
    • https://energooptima.hu/upload/File/dabekolijesesi.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/3eebd9851b57593bfe994715f3526d39/65017871083.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///4836668127.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/89155372196.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/saboratobiki.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/53465370104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fts+games+free+downloadPDF 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_off0000e278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8A 18028 bytes
SHA-256: 088045364377687042fc5a8a2f6b8b981764047af167b50791bca44f3e8eb3d5
font_02_sfnt_off0001294c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294C 10668 bytes
SHA-256: 7deaa592b01233a3181536cf6b6a191a4b3e5cbd326b0d397f2c0afe85fd4970