PDF malware analysis — malicious · 57df553a664bec78

MALICIOUS

PDF

83.3 KB Created: 2021-06-29 16:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 869aa4b09cb5e0e1efe0081bb16be219 SHA-1: 34ba2012f99238ed5648afcb791e8894cf8b9516 SHA-256: 57df553a664bec787da9d8d729acc6183c3e53189788d2d5589878a80c3f010b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggests a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern indicates it is designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://queure.ru/uplcv?utm_term=two+month+notice+to+end+tenancy PDF link annotation
- https://cardion.dk/gfx/fckimages/file/fapavitawu.pdfIn PDF document text
- https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/6c5add5699b39d6b1f6f14c073bd1a39/11190583519.pdfIn PDF document text
- http://medi-sen.com/files/files/xelenanebanimomap.pdfIn PDF document text
- https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abbd4fd1a8c---gajesuk.pdfIn PDF document text
- https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c4b507f10---zebufixuvajudotebuj.pdfIn PDF document text
- http://kaies.cn/upfiles/210619101914469994r37ojk.pdfIn PDF document text
- http://flex-link.cn/uploadfiles/files/wetefexoxifewasabon.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39b594b149---xefelafevubakusum.pdfIn PDF document text
- https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087dcd8073de---fusuresudetovox.pdfIn PDF document text
- http://ff-engineering.com/userfiles/files/wefejonilij.pdfIn PDF document text
- https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a9e6c189da---22953524868.pdfIn PDF document text
- https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/93c84852743c4ce5a6a0d46b2d56d4b7/81380293834.pdfIn PDF document text
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a91ec77d8c---lixobasofajawonegomogejiw.pdfIn PDF document text
- https://pinpointfeedtech.com/ckfinder/userfiles/files/pomikixoresumakozikik.pdfIn PDF document text
- http://helloshoppingnepal.com/userfiles/file/53271917313.pdfIn PDF document text
- https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/l250ci2gakk16rp52q7ff0k4ae/35112608610.pdfIn PDF document text
- http://www.verneteco.com/ckfinder/userfiles/files/97446130501.pdfIn PDF document text
- https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609d95ce773fc---gujowewasigenegupowixut.pdfIn PDF document text
- http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb5989b46e---wuxumosekat.pdfIn PDF document text
- https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/bbd56f9a8a816348f5bc2d28c2a32c98/69612112173.pdfIn PDF document text
- https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/2d2edf4ac0ee45a5ca6fe33baf845c6b/muridonik.pdfIn PDF document text
- https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/a685652950b077ce731ee60fe6cb35ae/20962240005.pdfIn PDF document text
- http://berbun.com/user_img/file/26813811419.pdfIn PDF document text
- http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750d86383f5---sotevoti.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_off0000e522.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE522	10484 bytes
SHA-256: `ab261240a4f848751068e331d89cc6b7cafbec2aa8d8a33d6d0d2daa8669b377`
`font_01_sfnt_off0000fcd6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCD6	16620 bytes
SHA-256: `0b7dee6c71d699203fdf13860661954c4d62b36736fc2eef2eba1189d8b50573`
`font_02_sfnt_off0001280f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1280F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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