Malicious PDF — malware analysis report

Static analysis result for SHA-256 c364ae5d3d0fc746…

MALICIOUS

PDF

73.5 KB Created: 2021-09-30 12:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c89af14d6db335a2e907a8eb37221104 SHA-1: c0fbb1432a48d15638729d9d503cff8b09b85e9b SHA-256: c364ae5d3d0fc7469210c9e45ca2f7e42a13915636a64e139fe32b097ff539a6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The file functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=vice+city+cheats+for+android+mobile PDF link annotation
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9d5541a3491a33f8346319c62132e5ab/56967747583.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322f3c4530f---negizumamameruwudixadom.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449eeb5228e---57535024016.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/gegirezerag.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/kujusifur.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/21497475237.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/42820485098.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b90c0a0e9---66349364847.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/12216980048.pdfIn PDF document text
    • http://exim5.hu/_user/file/79172806717.pdfIn PDF document text
    • https://equinox-e.com/upload/files/judareroxevapenebabaxa.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/zuzumelorinek.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/kekumusivosufatef.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/j1gjmdeuojm49uoa24trbb0ue5/64124427823.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/nonoditurejijeget.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161491b4f54275---87796982028.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613abdfa05de1---voxaf.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/zepofixenolume.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/38688032207.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/nojenafujigamunol.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/fakinemevajaru.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/14456c5f376987a5eda6b9a51af2fcaa/38217265894.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20219914123732.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/lebiwoxupevokawemalav.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_off0000b9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D4 17608 bytes
SHA-256: eefb2301c6b30212e4f4ce159c57ae57493ff989703775cdf1054de6450e4172
font_01_sfnt_off0000e6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 10964 bytes
SHA-256: f3d0f40a1e970d7aacfcb448285fe35ff48ccc4544814415a8e4ea13a10a53e9

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