PDF malware analysis — malicious · 478c4233e6e3baa2

MALICIOUS

PDF

88.7 KB Created: 2021-06-26 03:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: a90184133d8427fd831a321af035d045 SHA-1: 837e0c196c23c7cdc6faeb8ebc3e27ae290a9476 SHA-256: 478c4233e6e3baa2b92216dadbad83dd80423708e6bf55cf75a06fa625ebcb5c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body is unreadable, but the presence of external URIs and link farm heuristics points to an attack pattern involving redirection to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

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://archism.ru/uplcv?utm_term=diary+of+a+wimpy+kid+rodrick+rules+ebook PDF link annotation
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c76933e3e5---73176238114.pdfIn PDF document text
- http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d8af63486c7d16f13b2014eb0e0c751a/pomupupafajarik.pdfIn PDF document text
- https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd0a2ebcc5---217157824.pdfIn PDF document text
- https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5101f4b833---medevibodubo.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4fb67e9ab---visizuwibij.pdfIn PDF document text
- http://lws-realestate.com/userfiles/files/xizalifibajubimi.pdfIn PDF document text
- https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/197da7134a87636db680e4943d21bd35/62445115661.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e62849614---vifafivimukobexifiwuxi.pdfIn PDF document text
- http://workcoop.org/fckeditor/userimages/file/20210621033007.pdfIn PDF document text
- https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d1339c8a42914afe3e5cc7f1fcea3098/84748953835.pdfIn PDF document text
- http://prociweb.hu/sites/files/file/6229828208.pdfIn PDF document text
- https://debcopharma.com/userfiles/file/27664146473.pdfIn PDF document text
- http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8a6f91b97---74244856030.pdfIn PDF document text
- http://hasici-pristroje-eshop.cz/files/file/55836190077.pdfIn PDF document text
- https://flardochform.se/userfiles/file/sovoxanipazosixugalaxik.pdfIn PDF document text
- https://kham.vn/userfiles/file/73487384541.pdfIn PDF document text
- http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608358620bf3a---kivabeg.pdfIn PDF document text
- http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/dugatipegajikivofak.pdfIn PDF document text
- http://barcelonasixtytwo.com/userfiles/file/88153501216.pdfIn PDF document text
- https://asiarsolutions.com/userfiles/file/jupuvizutanopopugetofije.pdfIn PDF document text
- http://przychodnia-felinskiego.pl/uploads/editor/file/70860801449.pdfIn PDF document text
- https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/bbe5f0de43b434181578cf54591e16db/68556111055.pdfIn PDF document text
- https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e2283a12e---70872951552.pdfIn PDF document text
- https://amd-export.com/site/upload/file/raradiwoxuxurifudaw.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rh15b538iasc8fa0po3g71d602/xepunekoxovijuwofelividon.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d08c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD08C	16188 bytes
SHA-256: `800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34`
`font_01_sfnt_off0000e63e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE63E	30092 bytes
SHA-256: `02a37ad37f8176857e00df28ce696523dec367f34f9db176bfaae4b9d28b36b0`
`font_02_sfnt_off000122be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122BE	11112 bytes
SHA-256: `ef96b2c109e4d418f4594b1d319ef97c88c52731811d008de58fed15ff8cb3c5`
`font_03_sfnt_off00013c8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13C8B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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