PDF malware analysis — malicious · 1efdec48e829ee72

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 07:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: ca2b0e012429f8a38f484c744e7134aa SHA-1: fea1eb4f83da545cbc83903ff65b16fc5a60b14c SHA-256: 1efdec48e829ee72040661bd2bab3a9f923b7aef2833d80074f5466faec2e6fa

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, including one pointing to a compromised WordPress upload storage, and others on disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=alex+rider+book+12+pdf PDF link annotation
- https://www.sistemkabin.com/ckfinder/userfiles/files/fotavodekexevutasaso.pdfIn PDF document text
- https://eldorado777.ro/upload/editor/file/89416094596.pdfIn PDF document text
- http://alburigiott.it/userfiles/files/61351377635.pdfIn PDF document text
- http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/suletupafatudelerajewaf.pdfIn PDF document text
- http://china-miyaco.com/img/file/202196161217.pdfIn PDF document text
- http://meubelenindex.nl/images/uploads/6361429885.pdfIn PDF document text
- http://sangjeom.com/userfiles/file///71337599709.pdfIn PDF document text
- http://makassitools.com/userfiles/file///24719281604.pdfIn PDF document text
- http://jr.ac.th/ckfinder/userfiles/files/vikowemefulavufimigelitik.pdfIn PDF document text
- http://bloodfaces.de/attachment/file/8797134438.pdfIn PDF document text
- http://tatvideo.ru/ckfinder/userfiles/files/nuxodijodup.pdfIn PDF document text
- https://mallorcaboom.com/res/wysiwyg/file/55311233610.pdfIn PDF document text
- http://miraesusan.com/ckupload/files/633833863.pdfIn PDF document text
- https://sensiblemachines.com/ckfinder/core/connector/php/files/rutugoxupo.pdfIn PDF document text
- http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/30ac37a1ad2d163659bd324ce4412f42/bijezowuxadubegavuvem.pdfIn PDF document text
- http://artio.pl/files/files/66878709723.pdfIn PDF document text
- https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/pnk7br5sjgogh5nh889bcsfia5/mavimo.pdfIn PDF document text
- http://prestinoequitacion.com/imagenes/upload/files/88017284685.pdfIn PDF document text
- http://aromacosmetics.bg/assets/userfiles/file/2438748561.pdfIn PDF document text
- https://vildmarksjagt.dk/userfiles/file/pajugopogipedajozapoxo.pdfIn PDF document text
- https://cuatudongnhatrang.com/uploads/files/jofutojegelarolajesokoman.pdfIn PDF document text
- http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05483e6ff---71232327836.pdfIn PDF document text
- https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/fng09oabid13tsh6ebgf09jip1/zitaxefe.pdfIn PDF document text
- http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef3bbbb798---25425211272.pdfIn PDF document text
- https://amgaa.org/temp/files/wagekobulifedesikuna.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_off0000d44d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD44D	10448 bytes
SHA-256: `5f0d8a4e985f6fbc8e29b2dc128aa91ba6b4b71e2702f9bf2aa96ad329804898`
`font_01_sfnt_off0000ebe7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBE7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000103f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103F9	17984 bytes
SHA-256: `bc8a0b47a37b93ecf63563e53fa7a2da17f1cb539981730aec3b7bb602c4a2a8`

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