PDF malware analysis — malicious · 66c10b0e24d99f60

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 00:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 3e51e56d56eb69fd6aea16fe1d944622 SHA-1: 71ff5a36776978254d2bd7c496d736e0a8a71655 SHA-256: 66c10b0e24d99f60bd73d942dfb28d651a7a825bdf34d2a87ca29f18a1c814c2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which are associated with compromised CMS uploads. The document body is unreadable, but the heuristics strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9972

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 http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609735c05e5ff---bubosaxusetozumifalibe.pdf In PDF document text
- https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b02dcefb5f623dd3844d69fbe3f5b8ac/79310843884.pdfIn PDF document text
- http://nguoigiupviec99.com/webroot/img/files/zuruluvofavet.pdfIn PDF document text
- https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c29b211b059---16539208531.pdfIn PDF document text
- http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160849bb49a5a3---45504101982.pdfIn PDF document text
- https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/4u4a6uq99bqpl33d87eorb9n56/1778378206.pdfIn PDF document text
- https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/626hb18vipq5hb7srsjm5v6mu1/4953824461.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae6dbdd7a---sugofoduluriv.pdfIn PDF document text
- http://www.frank-diagn.hu/userfiles/files/nolodumaduded.pdfIn PDF document text
- http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fbdc2b7cb---73707653807.pdfIn PDF document text
- http://greddy.com/admin/common/ckfinder/userfiles/File/ronubatibofipuzinuj.pdfIn PDF document text
- http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/negumudikalimuki.pdfIn PDF document text
- http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e6261cabf98---51389578793.pdfIn PDF document text
- http://beepost.vn/upload/userfiles/files/25052437275.pdfIn PDF document text
- https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874a08cefc1---20098572928.pdfIn PDF document text
- https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5jnll1ol2el43o1ugtjdopojo1/20283041747.pdfIn PDF document text
- http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8789be0fd---9624869200.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/foau6p2q452etvd44ieut9rob0/gokasamonumurotenokiziko.pdfIn PDF document text
- https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/12aecfd688f646157c9d8b9ce88fa47a/nowedeniredigo.pdfIn PDF document text
- http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e10040420---wigigizuwupefemibuvamikek.pdfIn PDF document text
- https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ea1543a768507a4e22d80a53c85d08b/80015932092.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ncert+exemplar+book+class+10+science+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_off0000d7ff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7FF	18952 bytes
SHA-256: `531dfb86e47dc0d66f7e51ed4ca9177f0f625e8d182587327a700b0cc4f7077d`
`font_01_sfnt_off000109e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109E0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000121f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121F7	11268 bytes
SHA-256: `e984b021797e9e6001d3829d8042957417dafd02517f29e4592a9ccb3ef4ee5e`

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