PDF malware analysis — malicious · aafab1e57973a897

MALICIOUS

PDF

90.4 KB Created: 2021-07-03 00:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: cabe2c0797bd3f0423551f42677054f9 SHA-1: b88df42b96bded6db597decd337453d02a9131b6 SHA-256: aafab1e57973a89715352aaf2e87368b9200d5bad790e9a7de17948b43101a8b

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL

PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
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://inwebjor.ru/uplcv?utm_term=loan+amortization+calculator+with+additional+payments PDF link annotation
- https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/2d4348e44d7d58e0f0b663554a4e6ccf/mosefukufetukujawaxut.pdfIn PDF document text
- https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b4c6fbd79d30241244502af369396206/52074292290.pdfIn PDF document text
- http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/36428710726.pdfIn PDF document text
- https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b07872d6f6a---65437758925.pdfIn PDF document text
- http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/zetarupafavogoranutoz.pdfIn PDF document text
- http://adveotec.com/img/file/vaterisujetiparek.pdfIn PDF document text
- http://eszixv.hu/ckfinder/userfiles/files/tisomolidiwibojom.pdfIn PDF document text
- https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba5a91f16d---kegoxojalamajetikuteja.pdfIn PDF document text
- https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/a61e28cc7b2708c9a6c347d156fd6d06/71344628367.pdfIn PDF document text
- http://benly-carson.com/product/files/peripodivalujifipen.pdfIn PDF document text
- https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/86700877d76060212c5851ea8e36da5c/melukawanulexa.pdfIn PDF document text
- https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/739620fa13da259c6fadb7797f4fc81c/5473812100.pdfIn PDF document text
- http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/40299352268.pdfIn PDF document text
- https://5a.ro/ckfinder/userfiles/files/84227989312.pdfIn PDF document text
- https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/9206j213une05vonlg9ljaivrp/lekijagazo.pdfIn PDF document text
- https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d9bcda5b64f---nixibomigufi.pdfIn PDF document text
- http://strap.sk/uploads/files/pukop.pdfIn PDF document text
- https://paperland.bg/uploads/file/perigopebufomix.pdfIn PDF document text
- http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da22052b4b---76348719117.pdfPDF link annotation
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d86d89809---61963675119.pdfIn PDF document text
- https://akapacha.com/userfiles/file/56688472974.pdfIn PDF document text
- http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/devobidivon.pdfIn PDF document text
- https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/b93314cab30abb41bee45cf814bfb2a2/60503735556.pdfIn PDF document text
- https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608f41c85bfe4---4179017986.pdfIn PDF document text
- https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca17b44593---48958327739.pdfIn PDF document text
- http://dostavkaturov.ru/files/file/xekanexe.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_off0000fd90.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD90	11096 bytes
SHA-256: `8c828758e951712e9da92f61828b73c38a78d8de1cac02138473d346e9b2ebc7`
`font_01_sfnt_off00011754.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11754	16932 bytes
SHA-256: `6cbbf749af632da728aeaed2ec89725f3ba26e0df548eb932e949c27f6201feb`
`font_02_sfnt_off00014371.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14371	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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