PDF malware analysis — malicious · 5ce496ca7ba79f36

MALICIOUS

PDF

79.7 KB Created: 2021-09-01 17:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 257b05d23717508cc63b56df4b870ad5 SHA-1: a6539e498d928c68aa6b3a5c6053ca1eaa4dc490 SHA-256: 5ce496ca7ba79f3634a2b750edbf154dd6896e40152e7bb7634f57c121fab0e4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9944

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa5d4ea0b6---bowos.pdf In PDF document text
- http://lyzjkgm.com/d/files/31029912399.pdfIn PDF document text
- https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ij3gdbld08ukb57ha277msltr3/7379646794.pdfIn PDF document text
- https://fentesmakina.com/paket/upload/files/36820915020.pdfIn PDF document text
- https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/5e9cc8850d285514448f9f392592cc5b/73003000669.pdfIn PDF document text
- http://brandnewgoods.net/userfiles/file/95152892040.pdfIn PDF document text
- http://andlupa.com/userfiles/file/senunotega.pdfIn PDF document text
- http://csc025.com/userfiles/file/20210708140815_f2db6d.pdfIn PDF document text
- https://biothiennam.com/media/ftp/file/xupexozujiwinebavozojik.pdfIn PDF document text
- https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160708e2496835---tejomipositorevilad.pdfIn PDF document text
- https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/m9u3alvu4o8c8ag144kurmehqf/42766105818.pdfIn PDF document text
- http://sinojjacob.com/userfiles/file/tazasotilunipuxefa.pdfIn PDF document text
- https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/g0vg72br1k4aoskapti465e7vc/zebisonerutavikopijerixi.pdfIn PDF document text
- http://feg.vn/uploads/files/bivul.pdfIn PDF document text
- https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb351df2eea---verugelarepazide.pdfIn PDF document text
- http://www.findvoters.com/userfiles/file/nativezobariduwesataz.pdfIn PDF document text
- https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc0962b039---zezozeguguxijoz.pdfIn PDF document text
- http://marymo.ru/uploads/files/7426536956.pdfIn PDF document text
- http://macabrey-luthier.fr/data/Files/zegajulevawoxafijelunase.pdfIn PDF document text
- https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/58526060354.pdfIn PDF document text
- https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7efa1f25b9---rutavofapuxusutebivosexo.pdfIn PDF document text
- https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/d9ce8a13cb1d6fcaf3ac71be44e803fc/lesigafejate.pdfIn PDF document text
- http://parfumerieindex.nl/images/uploads/60315125745.pdfIn PDF document text
- http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160f13584246fc---puzaxitenobugo.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b70b709596---78964011689.pdfIn PDF document text
- https://paklya.su/design/img/upload/file/faxer.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+type+of+lever+is+a+staplerPDF 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_off0000d572.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD572	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ed89.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED89	10524 bytes
SHA-256: `37b3c53cc6c3073640388243e91de5393a84896429b3b73405e26c2f779cc609`
`font_02_sfnt_off000105b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105B5	16596 bytes
SHA-256: `e8d526d83ad8ea8deff01bd123f13fbc50354f3a3d7272f970e8e5b2f08ec02c`

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