PDF malware analysis — malicious · 702fe6c4ea55d99c

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 11:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 290adaaa3aef40f89782f1ae18c149d2 SHA-1: 738a4abb071a78a3ec07958f1875b3e9e5d2b96a SHA-256: 702fe6c4ea55d99ce0f198084078b4d61c8595eaec33bf5260a602240918b3ac

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious content or phish users. The file's structure and the nature of the URLs indicate a deliberate attempt to leverage compromised infrastructure for malicious purposes.

Machine Learning

Nyx PDF Classifier malicious score 0.9783

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://wastran.ru/uplcv?utm_term=thirteen+colonies+worksheets+3rd+grade PDF link annotation
- http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160848d3d59478---devimejotekumalisaminifij.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c963bcacd43---33501782930.pdfIn PDF document text
- https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc38d503aa---5290591100.pdfIn PDF document text
- http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a857d2d834---41610629426.pdfIn PDF document text
- http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/2567363199.pdfIn PDF document text
- https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609673e0cb15d---73615232381.pdfIn PDF document text
- https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161099c1fa6c88---difujotugeralofedokano.pdfIn PDF document text
- https://zemiigori.com/uploads/file/dalinulisepugawufolur.pdfIn PDF document text
- http://adaviestransportltd.com/userfiles/file/fabafibetev.pdfIn PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/35d83485d3591c4547aa06b2f05b06b1/71772549366.pdfIn PDF document text
- http://giovanniseneca.eu/userfiles/files/40792644889.pdfIn PDF document text
- http://worldofpacifiers.com/editor_uploads/system/files/luwibosodiberonubadilu.pdfIn PDF document text
- https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc03d538e0---wekovewefadasekexebu.pdfIn PDF document text
- https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/67305581386.pdfIn PDF document text
- https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/4mjciik68vagf4iepn62s8odmf/60243863245.pdfIn PDF document text
- https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/83eff3642022bf5203a638e5770ff9a5/29637002295.pdfIn PDF document text
- https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/1cdc48ef84251168cb4e50794a592b80/nafet.pdfIn PDF document text
- http://interno-kazan.ru/upload/files/bofunewabigororikemimidet.pdfIn PDF document text
- http://www.heksan.com.pl/file/9708131812.pdfIn PDF document text
- http://adasbruiloften.nl/userfiles/file/vunemomokomizuben.pdfIn PDF document text
- http://varadimasszazs.hu/uploads/files/87864516677.pdfIn PDF document text
- http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ab4d6d69b---48412198342.pdfIn PDF document text
- https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/75459658e3901073285a23ae3dc7225d/vopomonasugiji.pdfIn PDF document text
- http://krossinkeuka.org/clients/c/c6/c64aa726effa6776341672ea469011e7/File/43476877838.pdfIn PDF document text
- http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e6643d494---ladozuzofotu.pdfIn PDF document text
- http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160841ca58821a---82416313980.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off0000f29c.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xF29C	17856 bytes
SHA-256: `11549057d1ec2f52ab97c30fef0e0cb5a0e18d8a2ce9ca2a7f1f9cded986424b`
`font_00_sfnt_off0000c142.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC142	10960 bytes
SHA-256: `a3e7f903759a2489a6d8f39560c899cdfec5674c76d25eb73e19ae249a2a14d0`
`font_01_sfnt_off0000da8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA8B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00010e38.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E38	17956 bytes
SHA-256: `ac7a3195facce4168964b5fc6fd1264e918616481662fc5ebefbf8cc241c127f`

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