PDF malware analysis — malicious · 10e84a2691c17a9c

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 18:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 15f371b568afc1f02c43970b7c2a0155 SHA-1: 87d822bd4badc9f33df5140a668d1495ef13090f SHA-256: 10e84a2691c17a9cc66443c0fff77d7859719affef320d630b2ffb1ef387c2db

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces the attack pattern of directing users to potentially harmful external 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://drafthe.ru/uplcv?utm_term=legalism+and+confucianism PDF link annotation
- https://granitnet.hu/editor_up/novusu.pdfIn PDF document text
- https://taiwancy.com/app/webroot/userfiles/files/suvusajasigopagobiwim.pdfIn PDF document text
- https://shrisaiexport.com/lightspeedweb1/file/belebuligifonivilitireguj.pdfIn PDF document text
- http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/2157168620694639955800ebe92738ee/xawefefesatemejekaf.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7635d08e42---8103646426.pdfIn PDF document text
- http://cuatro-pr.org/sites/default/files/file/11154752662.pdfIn PDF document text
- https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/bbf864d2e75f2301e4a991113e8acbd4/xuganoborumedesefo.pdfIn PDF document text
- http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610317fc23f1d---damagebapukuzij.pdfIn PDF document text
- https://gencshoworganizasyon.com/upload/ckfinder/files/65032104396.pdfIn PDF document text
- https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/c7f38569e6125ce385f36f7dc376fc98/70919643838.pdfIn PDF document text
- http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbbd37ce59---44967619137.pdfIn PDF document text
- https://nhorizontours.com/userfiles/files/13710684356.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c49348442c2766e63b590f14a565aa5e/nuzazejizumafizazareriwem.pdfIn PDF document text
- https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/cc68efb96492950c0c3c883db4e63a0e/58853575799.pdfIn PDF document text
- https://tekstilkentrehber.com/upload/ckfinder/files/tubasumez.pdfIn PDF document text
- https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/12090fd5f2419e77f0c2997c939e9285/31517607027.pdfIn PDF document text
- https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160def0449f3bd---bemajekej.pdfIn PDF document text
- http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c513c69b4ad---jojabumubo.pdfIn PDF document text
- http://yesilderecine.com/admin/editor_resim/file/tewoposukog.pdfIn PDF document text
- http://alkanboya.com/files/file///xepakusotibesezejopo.pdfIn PDF document text
- http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091a1650a7c0---19170949160.pdfIn PDF document text
- https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/225278cd49c2958da6e7c08481721c69/zekunilefe.pdfIn PDF document text
- https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609a11e6a766f---jutomesumijasimovenatinu.pdfIn PDF document text
- https://ngonluathan.vn/images/ckeditor/files/35840630264.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_off0000da9a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA9A	10680 bytes
SHA-256: `f8979d18c0b949d9f1693262d6992a75bb6230b8643e108d6726e3d2e335ef08`
`font_01_sfnt_off0000f2d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2D0	18980 bytes
SHA-256: `521e7fe07668d844424dc87ada718c496ef48abd99e17f02c0036b9451c0013a`
`font_02_sfnt_off00012528.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12528	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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