PDF malware analysis — malicious · d15179b2bed719f0

MALICIOUS

PDF

75.5 KB Created: 2021-07-14 01:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: bc28771c825687c9123be1b214dc65bc SHA-1: 3fcb5440267440d1a9f28c1ca4ed2a64e63b6e8e SHA-256: d15179b2bed719f04b14858e484df39312f4802da33f7745538de100cb98adae

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9827

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://inwebjor.ru/uplcv?utm_term=chamdor+meat+packers PDF link annotation
- http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/k1io0veg3afe9c6htj0el1m522/10397602105.pdfIn PDF document text
- http://kulturazebrak.cz/userfiles/wotipuwijamimuliri.pdfIn PDF document text
- https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/nntadg0cicj0j6qvpeov4ndg0h/45912433248.pdfIn PDF document text
- https://ovalpolycoats.com/media/10337274494.pdfIn PDF document text
- http://btfa.tw/upload/files/jafumopexasutamuwudisa.pdfIn PDF document text
- https://elitstroycraft.ru/source/file/7114039822.pdfIn PDF document text
- https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/4bac110bc5d14f531478766d672eec73/zuvoka.pdfIn PDF document text
- https://actorconseil.com/files/file/sowodozaduvegomubis.pdfIn PDF document text
- http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/363a02cc13c72dd74becc854959d9eaf/53341644228.pdfIn PDF document text
- https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/418031bd9f4e4b034f10f3e608ab2b76/wonabisezij.pdfIn PDF document text
- http://goref.ru/files/file/dupijemuxeniboxufumab.pdfIn PDF document text
- https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daeca6ac4cf---8222825226.pdfIn PDF document text
- http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dee8b47565---70855046069.pdfIn PDF document text
- http://charivne.info/images/file/xijabu.pdfIn PDF document text
- https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b7637ab9f---mejomivofekilixibisez.pdfIn PDF document text
- http://netinflux.net/userfiles/file/temij.pdfIn PDF document text
- https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/34194632472.pdfIn PDF document text
- http://fcv-bo.org/data/fcv-bo/userfiles/file/4000474155.pdfIn PDF document text
- https://armandofalconi.net/userfiles/file/gagepukazuliv.pdfIn PDF document text
- http://lab4050.com/upload/editor/file/kizokawafareraser.pdfIn PDF document text
- http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/ximib.pdfIn PDF document text
- https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c88224afea9---21118826148.pdfIn PDF document text
- http://jamessham.com/admin/usercontent/file/77739049937.pdfIn PDF document text
- http://yourhealthyanswer.com/ckfinder/userfiles/files/pejagifanuwu.pdfIn PDF document text
- https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076031d85be6---49185530763.pdfIn PDF document text
- http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b59f9a72a2d---lavifevadela.pdfIn PDF document text
- http://travelshops.pl/userfiles/file/togemepowu.pdfIn PDF document text
- http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b6fa9aea6---lilutelomu.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_off0000c57e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC57E	16360 bytes
SHA-256: `a8377d2835de0743d518eee8bfa310592f6f7fb6008fa7fabc59e09df19cff72`
`font_01_sfnt_off0000f007.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF007	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001081e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1081E	10660 bytes
SHA-256: `82b4f0989d1d91ed5cee305e9e6876187de4c3ed62232369c025b73e25b4e905`

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