PDF malware analysis — malicious · ed4eb92b81e84afa

MALICIOUS

PDF

78.6 KB Created: 2021-08-26 18:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: f3755e4e964e10a37848f0a336fa422c SHA-1: 9dddb6bdda4c4755db72512468236378588fc343 SHA-256: ed4eb92b81e84afa80d8f431163993eb366f10ebe16fc55408b290d9892988bf

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or malware downloads. No scripts were extracted, but the PDF structure itself is leveraged for malicious redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9935

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://whatdwellswithin.com/file/59747064384.pdf In PDF document text
- http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7a138ca30---4977363225.pdfIn PDF document text
- http://barefoot.pl/userfiles/file/98006950547.pdfIn PDF document text
- http://lonerangerfanclub.com/ckfinder/userfiles/files/41276259498.pdfIn PDF document text
- https://dalycity.com/wysiwygfiles/file/notujisasonir.pdfIn PDF document text
- http://pb-book.com/user_file/file/fetutozovi.pdfIn PDF document text
- http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a5af0422968---fikozo.pdfIn PDF document text
- http://forter.vn/hinhanh/file/12217896677.pdfIn PDF document text
- https://nomaquito-travel.com/editor-images/bizazonutinagesizetubokex.pdfIn PDF document text
- https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098aeb78dffb---39598135056.pdfIn PDF document text
- https://oncallanatomist.org/ckfinder/userfiles/files/xalolezi.pdfIn PDF document text
- http://diakmelo.hu/ckfinder/userfiles/files/sasoze.pdfIn PDF document text
- http://saiprogetti.net/userfiles/files/videxowosek.pdfIn PDF document text
- https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/e60360653750f22d8d98b2662b8a3811/bumuxirukodidoto.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/sobepukit.pdfIn PDF document text
- http://slsnn.ru/content/file/29341192397.pdfIn PDF document text
- https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c86a24585---49134741482.pdfIn PDF document text
- https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9d7266d59---digakisomojukujitakor.pdfIn PDF document text
- http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bbff9116c---duliliritapikekodejiz.pdfIn PDF document text
- https://urbanlivin.lu/userfiles/files/lomigagoriketuf.pdfIn PDF document text
- https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a24b31e75---jozanigebixajugepulam.pdfIn PDF document text
- http://studiovalecchi.it/userfiles/files/fojawetimigaz.pdfIn PDF document text
- https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/dddcb2860ba79a4f0c198ec78a6c7b3a/21394800649.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b460134d0e---51697150885.pdfIn PDF document text
- http://csc021.com/userfiles/file/20210803194557_du30vn.pdfIn PDF document text
- http://harchovyk.com/userfiles/file/feduxifovupavuz.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=airport+development+reference+manual+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c7f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC7F8	10844 bytes
SHA-256: `a62079fa79801fc74426c0ef39a8022618e18efcddd9d3bc4b8f864455404ebe`
`font_01_sfnt_off0000e107.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE107	15972 bytes
SHA-256: `12c698d2957956ff8f5a9819758132ce22d2bb63b0695fe45558e17658d8e1c7`
`font_02_sfnt_off00010a1f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A1F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off0001222c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1222C	1860 bytes
SHA-256: `562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560`

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