PDF malware analysis — malicious · dc42a9a3d24e75f8

MALICIOUS

PDF

77.9 KB Created: 2021-07-24 08:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 56aeac8e86cabcaa8b1aabd734413512 SHA-1: d5b2c3e5d6c1b0e41c5dad08583c4eee0ef8d09c SHA-256: dc42a9a3d24e75f869ccbfc9be188ee84bf2ebda01f6ec40877aad896046ee80

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting, likely to distribute phishing content or for SEO manipulation. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a campaign to redirect users to malicious or compromised web pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9907

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 http://stroisvias.ru/userfiles/file/fidonuru.pdf In PDF document text
- http://snnet.kr/board_pds/fckeditor/2021/06/file/xevedekofukog.pdfIn PDF document text
- https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/aa0f6584e6b914c3f9f3bcd6a6e8b264/56731920482.pdfIn PDF document text
- https://nothingbutsafetyglasses.com/userfiles/file/xojaxovuwebavux.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985a36e6203---rinedageridad.pdfIn PDF document text
- https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/gei5947uuk8e6g0k2js8b1omge/42614361130.pdfIn PDF document text
- http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a72aa6cfa69---garozupi.pdfIn PDF document text
- https://limmaginebistrot.com/file/pemutemavetuwo.pdfIn PDF document text
- http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607095fd5d085---zeduku.pdfIn PDF document text
- http://toeicspeaking.net/_UploadFile/Images/file/91602859459.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/i08pt83d5jjh75lq5idfobjbfo/jinitizopofefiru.pdfIn PDF document text
- https://fishuntpesca.it/file/gonuginuf.pdfIn PDF document text
- https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc18cd80f99---xatamejifebaxavixogeseru.pdfIn PDF document text
- http://yizhu580.com/ckfinder/userfiles/files/pizuradibagolowunutoxevep.pdfIn PDF document text
- https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f3d99802505973548de1f73351987490/gogojudisajibupaxeb.pdfIn PDF document text
- http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16093e4da7dad4---39334214223.pdfIn PDF document text
- http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b04fc3b2a0---lorifipa.pdfIn PDF document text
- https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/9af82646e5978a403ff026c39a306a8f/63199541905.pdfIn PDF document text
- http://miltonhigh65.com/clients/874455/File/31157273943.pdfIn PDF document text
- https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/702d369d36d2f4a2a219ba342141cd66/68773130571.pdfIn PDF document text
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a9915af46---bavizimin.pdfIn PDF document text
- https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982da716728---81383448768.pdfIn PDF document text
- http://schokobrunnen.com/idata/romufetoziluzanut.pdfIn PDF document text
- http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/minapitevi.pdfIn PDF document text
- https://anthonygillant.com/userfiles/file/75881971116.pdfIn PDF document text
- https://hometeamcorp.com/images/usr/jonolanodo.pdfIn PDF document text
- https://pfhotel.gr/ckfinder/userfiles/files/zorikagexefajefa.pdfIn PDF document text
- https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/647be5k3pr2mrgcd1i03iuupmt/tudizojalogapozoraf.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=perspectivas+en+nutrici%C3%B3n+wardlaw+9va+edici%C3%B3n+pdfPDF link annotation
- 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_off0000c932.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC932	17036 bytes
SHA-256: `a698add1810fbc429138624ded5355847dde9df0241e48d4fe5b91154f568ed9`
`font_01_sfnt_off0000f4a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4A8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010cbf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CBF	11052 bytes
SHA-256: `741f1420e30305c2502eb4584c5d6114e80aa08929fe10a589a4207fae01296c`

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