PDF malware analysis — malicious · 79a4f621a1445a08

MALICIOUS

PDF

82.1 KB Created: 2021-10-08 00:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 200762bb847cecde14150cf9238ba2e0 SHA-1: a19a3271debf6b8dc4ce7fbf1ce705e2096fa7f9 SHA-256: 79a4f621a1445a087007fec28a348e6d56d2eab398489463f165343fac6c28a6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=the+whipping+boy+book+read+online+free PDF link annotation
- https://bellcera.60km.com/upload/files/wotaridesabavovukorunuk.pdfIn PDF document text
- http://storemisr.com/uploads/files/57178870051.pdfIn PDF document text
- http://branonperformance.com/ckfinder/userfiles/files/42041848893.pdfIn PDF document text
- http://canxetaidientu.com/images/file/50323684216.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/bt3q8ge4m7lfl26acp44rbu458/58212782267.pdfIn PDF document text
- https://sanvexe.vn/webroot/img/files/mikumivaxunoxofevirowuv.pdfIn PDF document text
- http://yugang360.com/upload_fck/file/2021-10-1/20211001214535673853.pdfIn PDF document text
- http://trivio.it/userfiles/files/71930345017.pdfIn PDF document text
- http://geopraxis.it/userfiles/files/88821446525.pdfIn PDF document text
- http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/vinukiso.pdfIn PDF document text
- https://bangvetthuong.com/luutru/files/duwirumegojatipu.pdfIn PDF document text
- https://biogenetixpharma.com/ci/userfiles/files/20274700211.pdfIn PDF document text
- http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/68123153189.pdfIn PDF document text
- https://digiconelectronics.com/media/sadetexemakagiwilakozud.pdfIn PDF document text
- http://ecofincas.net/ckfinder/userfiles/files/jimivakebufiro.pdfIn PDF document text
- http://nyitotthaz.hu/userfiles/files/24220755635.pdfIn PDF document text
- http://heryeryesil.com/resimlerfiles/98249160629.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e31a1cc155---36136765656.pdfIn PDF document text
- https://economiadecomunion.com/ckfinder/userfiles/files/jetupipej.pdfIn PDF document text
- https://eetravel.net/file/pubegikekunovebubolid.pdfIn PDF document text
- https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/44153078706.pdfIn PDF document text
- http://djk-winkel.de/images/uploads/file/jomogisewujinekonujid.pdfIn PDF document text
- http://hooleihomes.com/cms_images/file/guzowewulopibugekorumesuw.pdfIn PDF document text
- http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615957b044481---zavadevumukosite.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_off0000da12.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA12	10904 bytes
SHA-256: `40fc1ba6927a4d05bb3c640ce1c4d14cf19edcea43ca6e315b8064a43718dd33`
`font_01_sfnt_off0000f2d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2D3	18388 bytes
SHA-256: `624772d8c6fd60cc11a12b3204aedab237808a3976da091961fcdba54bcb3436`
`font_02_sfnt_off00012283.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12283	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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