PDF malware analysis — malicious · 39a4e57b00e0a63c

MALICIOUS

PDF

76.4 KB Created: 2021-05-01 00:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12

MD5: 8d2c68462f8afe62449df830b0992537 SHA-1: 0151018c129624bb8c442718479665e8487e919f SHA-256: 39a4e57b00e0a63c2ed0a20f934c1d8fcd95e50a14224376cef7c884d0d99ae8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains multiple links pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of these links, particularly those hosted on potentially compromised CMS uploads, indicates an attempt to direct users to malicious or deceptive content.

Machine Learning

Nyx PDF Classifier malicious score 0.9211

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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/a988018d4567ba7ce3869c4285ae042b/98616859137.pdf In PDF document text
- http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b40c94f416---69109826320.pdfIn PDF document text
- https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/9038657a9c08e1c449a2e9c2f8ea53ab/tosexobuxuvokukaxaga.pdfIn PDF document text
- https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/90b9dd4abd87dc52fd214f7f9a8afdc6/34650195832.pdfIn PDF document text
- https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/1d1bb8793fbe5221ba19ed15a6dc61b4/dopitejuxigaroler.pdfIn PDF document text
- https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/9cc0be5faf654963524539b793048f26/nijikixewuxefubilonobem.pdfIn PDF document text
- https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/44cb0051b54cf021830cc47c652cc9da/datoxijifinimif.pdfIn PDF document text
- http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085000d4bee9---84759792645.pdfIn PDF document text
- https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/641502a9d5a546d0f3b2103d174bf44c/48316279928.pdfIn PDF document text
- https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/f2c751fa2c92cb903b5662a2c55348d0/60470751907.pdfIn PDF document text
- https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/8d8fa0539a06cc3dbae02163ec5dee42/refeniduxizijelam.pdfIn PDF document text
- https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/7ondns3i6l18mmrk49jjjg9vhg/xulatorivimonija.pdfIn PDF document text
- https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/57085ec0fedf5aa096da3e34ddd6e355/98117971539.pdfIn PDF document text
- https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/sei3v69rm9f6805e73nrlk5mc8/xawajamuladasogovagejeloz.pdfIn PDF document text
- https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/594beeaa2618d351033774c2913b336c/neguxubisuden.pdfIn PDF document text
- https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ci7gut82l338dpuhskmnbperch/26030138267.pdfIn PDF document text
- http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160774c9c04f10---41883811748.pdfIn PDF document text
- https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/2cd2b6b1091f12eaf132724ecbdf3667/dapafuretekujib.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=video+online+free+from+any+sitePDF link annotation
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000eda4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDA4	4908 bytes
SHA-256: `997264dac6427a95e7eed40c59257a456694f00c1c76a028c743e56fac652b5f`
`font_01_sfnt_off0000fe36.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE36	11324 bytes
SHA-256: `b0fbc4f8041704326ab1d25044b934c0c7be3d47a61a64922f08dd62c3f91e27`
`font_02_sfnt_off0001245b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1245B	4324 bytes
SHA-256: `05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176`

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