PDF malware analysis — malicious · 5400536989861ec7

MALICIOUS

PDF

88.7 KB Created: 2021-08-21 03:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 794bb0cfa797237d5c82ffd3b7fc64f9 SHA-1: 4a702c229665a8cc1a6985a8e95895e8dc0508bd SHA-256: 5400536989861ec7cdd7bca1f166dca1396af7b02d9390b4e20205cba7ee0312

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this. While no scripts were explicitly extracted, the nature of the links and the ClamAV detection (Pdf.Phishing.Trojan) strongly suggest a phishing or trojan delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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
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://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lajevoxekosufi.pdf In PDF document text
- http://toroisg.com/public/images/files/82039173014.pdfIn PDF document text
- http://ashioke.com/images/library/File/mafipalamalubiluguzatano.pdfIn PDF document text
- https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a330a66bc664fd31c4b2235302bbcee0/sazut.pdfIn PDF document text
- https://camgloberealtor.com/userfiles/file/dulodevajixidijoxi.pdfIn PDF document text
- https://marigabung.com/contents//files/bigujufajevoxokuvam.pdfIn PDF document text
- https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a4ec19904fa5096055a186dfd69c55cf/fidedux.pdfIn PDF document text
- http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610383725bf32---88426655371.pdfIn PDF document text
- https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/1ejuaseffh3688442qsftean6n/41389247503.pdfIn PDF document text
- https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/1f309fc59e17a10fb0716c0aa966f114/56634152832.pdfIn PDF document text
- https://mn-lawfirm.com/box/userfiles/file/gunujisisaburapunu.pdfIn PDF document text
- https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f035b5f6cc---pojelisaxurozoku.pdfIn PDF document text
- https://open-call.fr/uploaded/files/romufukewimodirox.pdfIn PDF document text
- https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e30c2a7dd2---32866527752.pdfIn PDF document text
- https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/b8hi5sr2ttu42i9ad8ruqdl07l/48085456804.pdfIn PDF document text
- https://alakharia.com/public_html/userfiles/file/gewitemafutobopozinubob.pdfIn PDF document text
- http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c555cd03d---mipowisadiv.pdfIn PDF document text
- https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/78fb63adbe996e31364119a383bfcce4/newagovovagagukopeguje.pdfIn PDF document text
- http://nwatchonline.org/userfiles/file/30772215726.pdfIn PDF document text
- http://dioceseofniranam.org/userfiles/file/guguvilaxogamiwo.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/dca41b2de7066f49888018cf4f16f8f1/vokimewalixopunaloj.pdfIn PDF document text
- http://carrozzeriardue.it/userfiles/files/86136594090.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093f40f30f87---18729768320.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/c908cf4ec98c9b7625ebefc7a7a8ef5a/milutuzu.pdfIn PDF document text
- http://accessiblevehicleservices.com/userfiles/file/likow.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f46cb054226305c922e7263f5713f63a/loseretefisojaluduvag.pdfIn PDF document text
- http://highendschmiede.de/highendfiles/file/45279885156.pdfIn PDF document text
- http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/23671cf706221056120e9111116bad2e/rivogazet.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=complete+mathematics+for+cambridge+igcse+third+edition+extended+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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000efc5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFC5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000107d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107D7	18900 bytes
SHA-256: `479980737136f73473f1fa6367c20d750bdd0d310c6e1e892e44460704dc9be8`
`font_02_sfnt_off0001394b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1394B	11340 bytes
SHA-256: `3f9846a04e5bf0379cacaf6995f9d9984a4ce9c0fad8cb745974b36a08bf5c32`

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