PDF malware analysis — malicious · 83292eb8b7e1aa6e

MALICIOUS

PDF

91.8 KB Created: 2021-07-13 16:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 367127154c32ace9ba90834fea892d8c SHA-1: d0e831722047bc028c2224d3c3678c791b07cfae SHA-256: 83292eb8b7e1aa6ead100cb73951e1787aa08dd3af6b84ed510dc0f75a9eed1d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised WordPress sites. The embedded URLs suggest an attempt to redirect users to external, potentially malicious content, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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://ketchas.ru/uplcv?utm_term=expanded+accounting+equation+examples PDF link annotation
- https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dfed4d67b---45170094909.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/19887d5d59db264981ab5e515bb42677/77966135577.pdfIn PDF document text
- http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2015340c5---76226980800.pdfIn PDF document text
- http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6d03b3e78---denenuxakadadilopifisafu.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988fce3018d---ribasiniluwuwomukopafita.pdfIn PDF document text
- http://medical-1669.com/userfiles/files/wibed.pdfIn PDF document text
- https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/7i8tso18kh96s1fga3qo9fsgqm/mobozeb.pdfIn PDF document text
- https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/h0ijja411fq8i6bv08nstkifba/48102317127.pdfIn PDF document text
- http://yameitecl.com/ckfinder/userfiles/files/20210710_110211.pdfIn PDF document text
- https://barrierball.cl/ckfinder/userfiles/files/kokipebuvorona.pdfIn PDF document text
- https://agrilaui.com/userfiles/file/98525683047.pdfIn PDF document text
- http://creativeindustries.ru/uploads/userfiles/file/mekedurutulolufebuwujez.pdfIn PDF document text
- http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160afddfd357ba---42844260812.pdfIn PDF document text
- http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f785284eb---57169542476.pdfIn PDF document text
- http://extracam.es/app/webroot/arxius/file/konimosadogulolosigoz.pdfIn PDF document text
- https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ec510d9997b---feragivujosoxu.pdfIn PDF document text
- http://stark-tools.ru/images/uploaded/fevajalotixu.pdfIn PDF document text
- https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/jc095u8c779cph515njpv347eo/46311213648.pdfIn PDF document text
- https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/gmnd454v46g8sgfrpevsmtcdqs/78794043303.pdfIn PDF document text
- http://aylincinarli.com/fckfiles/file/24794117204.pdfIn PDF document text
- http://jrpst.pl/userfiles/file/fosuxilifemisaferoxurepi.pdfIn PDF document text
- https://strategieb2b.com/userfiles/file/rifitatuzodolefevikebepem.pdfIn PDF document text
- https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b35fdc42d7---90055364353.pdfIn PDF document text
- https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/1jddl4raup0dg4ufbksp0gun18/nujunupegojulirevewe.pdfIn PDF document text
- http://tnslib.su/userfiles/files/metapalixifoxemamileseb.pdfIn PDF document text
- http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e9cbcbeee---tevobaz.pdfIn PDF document text
- http://web68s.com/upload/files/wowanotasomegukoxe.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fff6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFF6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001180d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1180D	11088 bytes
SHA-256: `c0b7e2e17a37544f33e46972bb57c77c4cc0a5e4b63c2b1b022fa76d8f7c4959`
`font_02_sfnt_off00013152.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13152	17624 bytes
SHA-256: `9ea699e624c4ad9e6c3eb1caaf1b9921dbf4244504435700bc5da9059bd9e052`

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