PDF malware analysis — malicious · 3378c4d19ff806e2

MALICIOUS

PDF

75.8 KB Created: 2021-09-08 11:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 0ca5aa8f336e029774f98facc0aad7b2 SHA-1: 75a2099a9f59b3eb6633f8b3269fe69b584ac069 SHA-256: 3378c4d19ff806e243d7b13ae4c927342557f93039fe811f0ae13baad8017802

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are consistent with a link farm designed for SEO manipulation or malicious redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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 https://pistant.ru/uplcv?utm_term=transistor+circuits+manual PDF link annotation
- https://icon-studios.com/userfiles/file/42378227953.pdfIn PDF document text
- https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/ddc0935b939938431702a7a117f1f1a0/tezalelok.pdfIn PDF document text
- http://uco-kampen.com/media/files/22086127177.pdfIn PDF document text
- http://humanitool.ru/userfiles/file/xomumobunano.pdfIn PDF document text
- http://xn--szabowski-tub.pl/userfiles/file/78770017076.pdfIn PDF document text
- http://automsystem.com/UploadFile/file/20210619082415902.pdfIn PDF document text
- http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/lexugobozexujovapewukox.pdfIn PDF document text
- http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986e4340fe1---43153605219.pdfIn PDF document text
- https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/0b748accd3754d1fffa16fd13ff1fa1d/24117426943.pdfIn PDF document text
- https://thic.net/plugin/ce1/ckfinder/userfiles/files/40808465673.pdfIn PDF document text
- https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/9bfdc4f3a23b586512f4018ac5c3b21b/rozikuduwoduwozujomovogir.pdfIn PDF document text
- https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ba9053d74447784b239a92f05fdcf7f9/xovexivaleduponikumem.pdfIn PDF document text
- http://www.awakohchang.com/image/upload/File/upusak.pdfIn PDF document text
- http://bindashnews.com/userfiles/file/74204592958.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d16ef2fff8---17918502109.pdfIn PDF document text
- https://pragatitic.org/ckfinder/userfiles/files/fafirilusubiv.pdfIn PDF document text
- https://cpsguffanti.com/uploads/file/relomod.pdfIn PDF document text
- https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/ef1c99224eadb49aa4ebc932b79d6427/53708611972.pdfIn PDF document text
- https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767df4c25dd---74537870015.pdfIn PDF document text
- https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/dc37867cce13f66c35ab7cf49ff7c5ee/mepupifid.pdfIn PDF document text
- https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4cf1e87a8---fuberix.pdfIn PDF document text
- https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070170c54044---rujebilivagowi.pdfIn PDF document text
- https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/13468325e8008fc864e33e7fcc8c14f5/21770296257.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/v6jb9jmgnf1l000faj08q9jv58/wigaguwuximetikoberuvi.pdfIn PDF document text
- https://infoenergie-loire.org/userfiles/file/silaja.pdfIn PDF document text
- http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100292559d73---pimotaxi.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_off0000c96e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC96E	15968 bytes
SHA-256: `323a52969f67dded305ee4ddb8361ab649cd579cca119e688fdc1e37bce50b18`
`font_01_sfnt_off0000f249.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF249	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010a60.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A60	10324 bytes
SHA-256: `7c69793b7539ae5d032c5cb9c3ae5f7df1c9572499cb1343096a863399c9bffa`

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