Malicious PDF — malware analysis report

Static analysis result for SHA-256 7768f94632aabb12…

MALICIOUS

PDF

98.0 KB Created: 2021-09-04 11:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b0c937f709b59780e2b2607ffafb9f91 SHA-1: bdfedf0bbbc9f692e4866022e93c0c1644f56d20 SHA-256: 7768f94632aabb129282dfb4713691d4196555ae2f1ba4e08d7bb00baef16f43
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to WordPress sites with formcraft or super-forms plugins, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ketchas.ru/uplcv?utm_term=scholarship+application+form+pdf+assam PDF link annotation
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09b79ff9e---43785225167.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/81674953690.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/255c4fe0bd56a83190277096e4154bd1/84132465663.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9301dc754---9941346489.pdfIn PDF document text
    • http://aven.su/userfiles/file/wizofumitawu.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/1e82f81fe7693e751eaeba2b1d37875a/sejofidoduxifigijakuzin.pdfIn PDF document text
    • http://klinok-saintp.ru/files/mikezebise.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/jqf7asu6ai9blt3f2tv1qp65u1/wutedizojimefowa.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/e4qv6dnelmjabcg6rfjtcig4s3/delejavuvuboriwadopekum.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/zosazuzazudelizigadi.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf21d204db9---36492434977.pdfIn PDF document text
    • http://dzbnf.com/upload/file///xulewetuviwukini.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/rizuzepubomedowis.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210611022337.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/94931982983.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/88464943653.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/70654224970.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/78246000676.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/zefiwezagikil.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ec96ece11---82438737827.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/366185ac254683738d67206ef0e1e038/10616848050.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d04240087---53921435596.pdfPDF link annotation
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a86cd8c25d1---59875750152.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/ae81946cb2aa210dcd43e1b2a309fec7/wegadip.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/97621584260.pdfIn PDF document text
    • http://tyextractor.com/d/files/gufuzapemotesixoleloz.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_off00011c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C62 17404 bytes
SHA-256: 78355ec03a2929fe9f9e212834078ea8d5faffcffd657de462be657307adc216
font_01_sfnt_off0001493a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16151 10828 bytes
SHA-256: 5030f5cc13e15f387183389f701f4d8524521bac807c87904e2dc2ff43c85f9c

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