PDF malware analysis — malicious · a67c8bc67eae88e2

MALICIOUS

PDF

86.6 KB Created: 2021-07-19 18:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 7dbfa256631dc61c9cee4b91ce50f1dd SHA-1: 95923ea6a653408d22e23e39c760fee0a61b55f7 SHA-256: a67c8bc67eae88e22e1f836d96bba381e8002cd318425c291d7942322e6541d9

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous links pointing to compromised WordPress sites and the use of 'utm_term' parameters suggest a link farm designed to distribute malicious content, likely disguised as educational materials. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's a lure for downloading further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9952

Heuristics 7

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160d692ad4d068---jigojefizulizabaxisevojas.pdf In PDF document text
- https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f01b660a97e7c40740a2382612a71288/33841469190.pdfIn PDF document text
- https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dac439004c---23247511580.pdfIn PDF document text
- https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/809a1a50a0cf30045ad6d246f485bb99/60244040699.pdfIn PDF document text
- http://kythuatviet.vn/uploads/userfiles/file/51967232885.pdfIn PDF document text
- http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f333215e9d---jamidokuridezaso.pdfIn PDF document text
- http://rotarycochinharbour.org/ci/userfiles/files/vaxagogusudasulesekiwego.pdfIn PDF document text
- https://paperland.bg/uploads/file/nuwadogewawulamodozina.pdfIn PDF document text
- http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/11s7ll8o6nd22senekofqlts56/kisebijuzez.pdfIn PDF document text
- http://aarogyamedico.com/userfiles/file/numisineboxomoxoxedupetag.pdfIn PDF document text
- http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/idkj4kh6vui5mvbh7b7p3h6rfh/74591638734.pdfIn PDF document text
- https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cef61b503---3023297004.pdfIn PDF document text
- https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/i0stmmbebvtg64gmp14ubl8lpq/pevadizavexebuwuxuniw.pdfIn PDF document text
- https://xuanhongkhang.com/upload/files/2648491359.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8ggpo139isapqbb7mf70t6j090/lokijetebizusokefev.pdfIn PDF document text
- https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6487b539b4---99395499892.pdfIn PDF document text
- http://peak-experience-japan.com/sidep.pdfIn PDF document text
- https://gencerenerji.com/resimler/files/pizekipavujasifezom.pdfIn PDF document text
- https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/f27aa439415ea4e17f439ab6a8407753/202062715.pdfIn PDF document text
- https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086c41341a19---9922823672.pdfIn PDF document text
- https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c3e675360---89286405707.pdfIn PDF document text
- http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b8c14b861---80837292088.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aea8be78e---19292251336.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cbse+class+9+french+textbook+solutionsPDF 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_off0000ee4b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE4B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010662.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10662	11068 bytes
SHA-256: `dbff2c6eb34f030609f570da9e5df6f6a61480a9c2b6af48ce89e6c222c37889`
`font_02_sfnt_off00012027.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12027	17696 bytes
SHA-256: `094cf2a9e071b93b7bbf88ecb2e6ff966a17529709c9fb4975103ad120f64d5b`

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