PDF malware analysis — malicious · 38ab18ba3c3550a1

MALICIOUS

PDF

88.1 KB Created: 2021-09-07 18:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 907e8e82548200f54a3829e3387dcbc3 SHA-1: bc271bfd6e2e14d5667cef3b3622bb0b03bc4308 SHA-256: 38ab18ba3c3550a12c57ee6a56b039cb5389bd2e9abf281bb7782c1cb6d566d5

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to obscure the true destination. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass security scanning. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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://crysiq.ru/uplcv?utm_term=base64+online+pdf PDF link annotation
- https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c029441e93b---duzudotewi.pdfIn PDF document text
- http://fulepmark.hu/nyebu/fulepmark/userfiles/file/kimejolanefokidapefag.pdfIn PDF document text
- https://aimhc.com/userfiles/file/zekigosutowid.pdfIn PDF document text
- https://kozhikodedeaf.org/admin/my_files/file/pilipizitosivod.pdfIn PDF document text
- https://spvi.cn/filespath/files/20210821073410.pdfIn PDF document text
- https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073140da5ac9---58586570329.pdfIn PDF document text
- https://legouic-peinture.fr/userfiles/file/1746668917.pdfIn PDF document text
- http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26061645120.pdfIn PDF document text
- https://europartner2.pl/uploads/vupolowiweluguvuzuparag.pdfIn PDF document text
- http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aac0cb8448b---69502236182.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096561186b5e---38400891688.pdfIn PDF document text
- https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a545f0c8bd9---podoligi.pdfIn PDF document text
- http://execdentalclinic.com/uploads/ckfinder/userfiles/files/butuviwatudakidof.pdfIn PDF document text
- http://3bbb.fr/ckeditor/upload/files/7507011277.pdfIn PDF document text
- https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/0ba624dcecc9e9c5c48027514e49e92b/nipiripotezufujadumepam.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/66ceec0bffd186622604c8ecff189570/34035645233.pdfIn PDF document text
- https://rallstarawards.us/nbloom/fckuploads/file/bejadigemimoge.pdfIn PDF document text
- http://chikatere.com/Upload/files/51935786551.pdfIn PDF document text
- http://alptw.com/images/files/besavubomoroboxitexagos.pdfIn PDF document text
- https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d109df1c9f6c452916495fda76f7af5/pajimexevanovikisa.pdfIn PDF document text
- http://lepal.sk/ckfinder/userfiles/files/27563005707.pdfIn PDF document text
- http://travelsi.ru/ckfinder/userfiles/files/2782960636.pdfIn PDF document text
- http://paolacaone.eu/userfiles/files/nediwoguzositemi.pdfIn PDF document text
- http://fabtur.ru/upload/files/jumepadexijagibal.pdfIn PDF document text
- http://angelofthewinds.org/ckfinder/userfiles/files/45404248579.pdfIn PDF document text
- https://ikomsolutions.com/admin/userfiles/file/68987872589.pdfIn PDF document text
- http://afgventuregroup.com/cfiles/file/11062892893.pdfIn PDF document text
- https://laetitiabernard.fr/images/file/parop.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_off0000f22a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF22A	10592 bytes
SHA-256: `4b4d809c805be9b8dece8f2db123c128a93698dcdb7cd6c8a6c4c6578637d2e7`
`font_01_sfnt_off00010a81.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A81	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012293.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12293	18424 bytes
SHA-256: `ead81668a2a445df061643e6521388e9ad11054d8d245fb0e7735fc95d4d21b4`

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