PDF malware analysis — malicious · 5b922d68b96379e6

MALICIOUS

PDF

70.8 KB Created: 2021-09-06 16:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 34b71bff3ac56fb7370b8f81948103bb SHA-1: 8ba08e743b5284cd3b2a3427e8b4730dc3688191 SHA-256: 5b922d68b96379e66f2f6d9c1ecc1fce2ed637ad46390c83452266533bd4b74d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to compromised WordPress sites and disposable domains, suggesting an attempt to lure users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9837

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://crewmak.ru/uplcv?utm_term=multifiltrate+fresenius+manual PDF link annotation
- https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/91871ddb5eff4daeb96c05a90d01658c/rivowaviwigerunuxi.pdfIn PDF document text
- http://www.peritaonline.es/ckfinder/userfiles/files/71714053263.pdfIn PDF document text
- https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/81bde643bb6608d9ecbd5f33ea304c61/70671058449.pdfIn PDF document text
- http://www.cafeinca.com/img/public/contenido/file/77565785300.pdfIn PDF document text
- https://bhandarisurgical.com/ckfinder/userfiles/files/tofixokabisa.pdfIn PDF document text
- http://maxidmum.com/images/upload/fck/file/63720692600.pdfIn PDF document text
- http://hanasushimenifee.com/uploads/files/90436232318.pdfIn PDF document text
- http://happinessgown.com/upload/users/files/wezotewejesidigebitor.pdfIn PDF document text
- https://ildiko-szepsegszalon.hu/userfiles/file/pewirapukiragifoz.pdfIn PDF document text
- https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/fc4d03f4206f6f00c0da205b5bb36c4c/95609569722.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/33106354546.pdfIn PDF document text
- https://bokaichenyu.com/upload/files/kosevitaf.pdfIn PDF document text
- http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb03852d602---wivarofexugosurozip.pdfIn PDF document text
- http://zuche0551.com/upload/file/xepemufalavadunumuzuvow.pdfIn PDF document text
- https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a24b36adb2---gotimavukonusalokonik.pdfIn PDF document text
- https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/47019632386.pdfIn PDF document text
- https://gw21.ch/uploads/userfiles/file/26502769129.pdfIn PDF document text
- http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eea757eaba---58737401461.pdfIn PDF document text
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607812ba0f9ce---taxojorunagifelikofab.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/3acf0beae5712e9a8417972d32181617/23549649764.pdfIn PDF document text
- http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/56312896875.pdfIn PDF document text
- http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/da9hirbjaph6eevunqrjmk6kqd/68013666690.pdfIn PDF document text
- https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/38c9dba18448945eb38d0376e22ddac4/96717861737.pdfIn PDF document text
- https://gachbinhduong.com/upload/file/delexuge.pdfIn PDF document text
- http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160812c38d8aff---poxabetawurisixorojosaxo.pdfIn PDF document text
- http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079172d3c2b9---wujoteruponope.pdfIn PDF document text
- https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/b2gblgl19he79ur7s9ncsv8g7b/40330748434.pdfIn PDF document text
- http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/tlm4hi7u7nccr7ei4tgfj28pk4/vurovebaxisawafam.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_off0000b990.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB990	14820 bytes
SHA-256: `4b11cd6db1f1095d279ecc847a4861767a60b93d6d03793a106655332789a11a`
`font_01_sfnt_off0000de58.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE58	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f66f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF66F	10348 bytes
SHA-256: `7b9e96a88f47d7ce0ce27d77e703e18889c024b6d83e997e0d531035b9b90058`

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