PDF malware analysis — malicious · fd45537633d8049e

MALICIOUS

PDF

71.5 KB Created: 2021-09-27 23:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: f8b4925e8472ad84ccfa7ab652cf3ad3 SHA-1: 8c9fafe07e4e2e8740a038b959036e7a49093c7e SHA-256: fd45537633d8049eed9fae360ba45c91656bd462e612ed0eb70ea0d02baca5b6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's part of 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.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=notice+and+note+nonfiction+signposts+pdf PDF link annotation
- https://wintechindia.in/ckfinder/userfiles/files/gobatidega.pdfIn PDF document text
- https://arab-hams.com/Ups/files/98720791561.pdfIn PDF document text
- http://porpora.biz/imagenes/imagenes_contenidos///2791050663.pdfIn PDF document text
- http://murito.fr/ckfinder/userfiles/files/26614319652.pdfIn PDF document text
- http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16150f5f1ab978---zogobokitizijovowubomobij.pdfIn PDF document text
- https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9c085394---89713308741.pdfIn PDF document text
- http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161442b295fe9c---71033173035.pdfIn PDF document text
- http://klawiatury-foliowe.pl/_data/file/dezizanomeferuzojeximes.pdfIn PDF document text
- https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423331c1f2e---wadutevuwiruvowigidofosal.pdfIn PDF document text
- http://lorichphoto.com/pictures/file/belulumon.pdfIn PDF document text
- http://gzcaifeilai.com/ckfinder/userfiles/files/202109081556036268.pdfIn PDF document text
- https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/famogabag.pdfIn PDF document text
- https://avukat.dnsaktif.net/upload/files/rokalanamijusu.pdfIn PDF document text
- http://gemaeldeundobjekte.de/uploads/files/koxopasodesavejuz.pdfIn PDF document text
- https://footballsod.com/images/ck-uploads/files/webewebanadebaj.pdfIn PDF document text
- https://soudurelauziere.ca/upload/editor/file/banefijobigifusex.pdfIn PDF document text
- http://aptwash.com/userData/ebizro_board/file/mosoxifox.pdfIn PDF document text
- http://xn--80age2amlc.xn--80adxhks/pics/images/file/xoramogumajora.pdfIn PDF document text
- https://spheresignal.com/app/webroot/userfiles/files/nuvusamakijevevafutozime.pdfIn PDF document text
- http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/14aecc7442f39d8cdeaf614173f76f2c/19266996514.pdfIn PDF document text
- http://bassonconsulting.mc/userfiles/file/27938097526.pdfIn PDF document text
- http://www.rupankar.com/fckimages/file/84105869426.pdfIn PDF document text
- http://minhledtran.com/luutru/files/29925763047.pdfIn PDF document text
- https://fullprotec.com/ckfinder/userfiles/files/28563737428.pdfIn PDF document text
- https://gikguamerica.com/userfiles/file/12217905337.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_off0000b4ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB4AC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ccc3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCCC3	10624 bytes
SHA-256: `ea618f0b65dbbf693ad387d3e2e4cffd2b97839d523b63fac9292e970fb008f6`
`font_02_sfnt_off0000e502.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE502	17152 bytes
SHA-256: `b5106601b506bf60bd7cb5ecdceef4e761f3df09cfc9b121039b84735b8a12dd`

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