Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a875473679057f2…

MALICIOUS

PDF

95.6 KB Created: 2021-07-28 07:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5fd4567595c22728a32e22fc6d86ead SHA-1: 9e6f41e391e4661f2355683e07b6d8410a217836 SHA-256: 8a875473679057f22e2af9c0da779807ccd922023a578a0b49a08415458eabec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0f3fd477d---78211487811.pdf In PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f121e5535b7---rujogeri.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/08ffb8fac6ce9d2142a3c67d9c774a5c/61909603615.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/15118129573.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/kavawadebufutojeburivum.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/0n0e5danrids3p90nqbelp2m3c/83515749171.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd02aacfca---58206093345.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfab22b00d6---94603081905.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/59530960156.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/9ad658485b056d37dcec7ceae70086a0/31920554959.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/fanuriwuponovewupujo.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/dejazupijedo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac0d85c86b---fikefafabipekem.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/24523813033.pdfIn PDF document text
    • https://kildevangen.dk/files/38642061277.pdfIn PDF document text
    • https://andrejc.si/files/file/woterewakimefanetujiwa.pdfIn PDF document text
    • http://allasclub.com/campannas/file/xipavow.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/82285088059.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/31e3571c4be2bbfa2ae8a4d00ead81c4/82628812912.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/weduvozusizefebiguju.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/17172e0f1fdfed6b9e22a90b5b9647b6/2414841408.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6e2f1d21---kuvijovufi.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/d69e0156598f1d9623902e194686d268/97733187171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ejercicios+palabras+hom%C3%B3fonas+y+hom%C3%B3grafas+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_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 20000 bytes
SHA-256: 4d83a2b3119d01d468048a6a481abcc94da6842935d7133403874b43a2985455
font_01_sfnt_off00013a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7E 11476 bytes
SHA-256: ecfeec3d556bccb91be30ec091f8bebabb7faec7809ee85d87bce2e791f17f8d
font_02_sfnt_off000154a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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