PDF malware analysis — malicious · ac48b1c4f7e33c17

MALICIOUS

PDF

82.8 KB Created: 2021-06-27 07:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05

MD5: b320e21f100a5b1aa31a0fe71fcf8014 SHA-1: 1cb8fb87daf516d76eb9e0fef7dbc08c9b33926e SHA-256: ac48b1c4f7e33c17615c74c4a94cbdadb92ef0a41e6e32bb8015a043cc8f89f4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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 https://inwebjor.ru/uplcv?utm_term=legally+prohibited+meaning PDF link annotation
- https://embassyinvietnam.com/webroot/img/files/71827399761.pdfIn PDF document text
- http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070e31ccd925---sexujanezum.pdfIn PDF document text
- http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/152029f2814fd390feb0776ca47a5271/dabobewagakowutofet.pdfIn PDF document text
- http://gt-outillages.fr/ressource/site-image/files/10061803461.pdfIn PDF document text
- https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/2d0c326a68fa5e8477812e9e4041d4bd/dasigodunutug.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607693ba030be---6102269124.pdfIn PDF document text
- https://ntct.dz/ckfinder/userfiles/files/xowuvavefezuwasazob.pdfIn PDF document text
- http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eac91d9870---lebimarodusa.pdfIn PDF document text
- http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b300a1036---bafod.pdfIn PDF document text
- http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608423bd9f30a---48553714279.pdfIn PDF document text
- https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/sr9joidr2ch75kiundicdd2dgo/55774599005.pdfIn PDF document text
- http://naasschoolofmotoring.ie/fckeditor/userfiles/file/56596267022.pdfIn PDF document text
- https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a45a93f2b77---dafaxoleju.pdfIn PDF document text
- https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609849c99adb1---19544637041.pdfIn PDF document text
- http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/vazarodugova.pdfIn PDF document text
- http://internationalnetworksolutions.net/files/62869828413.pdfIn PDF document text
- https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d135933a07---50463395970.pdfIn PDF document text
- http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d97e2648d0---zifumurogajogokesamuta.pdfIn PDF document text
- https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/igftom3us3tm6om1cff2447a8d/boditeguwuwoj.pdfIn PDF document text
- https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ed98b3e8d---7977733419.pdfIn PDF document text
- https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96573314c---45756263388.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607346153517b---xuron.pdfIn PDF document text
- https://angkorphotographyguide.com/userfiles/file/89519113010.pdfIn PDF document text
- https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a18c9e431ed---48964743704.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_off0000e108.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE108	10884 bytes
SHA-256: `b78b70d1e3c043cda07518655e46c2eed0f3b8040df6b6d623a66a4f5f625bd3`
`font_01_sfnt_off0000f989.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF989	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001119b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1119B	17052 bytes
SHA-256: `926eb3d45e729b2c2c239678f63a04e100479efdbe0867a5b7d35c96a37584b1`

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