PDF malware analysis — malicious · 2f9a7ea3e390146f

MALICIOUS

PDF

87.0 KB Created: 2021-07-13 02:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 82e723693eb0c22072037d71904eb547 SHA-1: 543171f40288ab9cbbd5f5723f16567dbbaa9c02 SHA-256: 2f9a7ea3e390146f38361c7e309272d8519096d9343fe0165d3e1a7f8cf3cbf4

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. The document functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing or spam campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://allytemp.ru/uplcv?utm_term=cell+division+multiple+choice+questions+and+answers PDF link annotation
- https://jodhpurtravels.com/nbloom/fckuploads/file/ruxavujomafu.pdfIn PDF document text
- http://xedaptheduc.net/app/webroot/uploads/files/poxupor.pdfIn PDF document text
- http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/21786371746.pdfIn PDF document text
- http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba11a049350---68467408625.pdfIn PDF document text
- https://healthmatters.me/userfiles/file/16175598461.pdfIn PDF document text
- https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/f2a87021bdc18f98a05f8714904fcdc3/27761278493.pdfIn PDF document text
- http://bscartridge.com/pic/62800410608.pdfIn PDF document text
- http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a00b00cc2---49819761290.pdfIn PDF document text
- https://xenang-mitsubishi.com/fckupload/file/92894006248.pdfIn PDF document text
- https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/b4efe2e0d9eaadc5e541739d18f67acd/xejipaji.pdfIn PDF document text
- https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/b6755789f52537c58e444e985d049fa8/65580648546.pdfIn PDF document text
- http://ccspatti.org/userfiles/file/rolanumatizasuxixunukax.pdfIn PDF document text
- https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/cea9f7a068ae62733ef64db8c25d2128/rozomol.pdfIn PDF document text
- https://bbpartner.cz/userfiles/file/61558315611.pdfIn PDF document text
- https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aea51b414de---72815927624.pdfIn PDF document text
- http://stevis.cz/files/file/xisizozotuw.pdfIn PDF document text
- http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9eadb5191---retebujakaresu.pdfIn PDF document text
- https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/676e216250f604e5686179e67c8ff641/40441992045.pdfIn PDF document text
- https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/4cc495ebd6b30df78289b103501dbb0c/sorazodun.pdfIn PDF document text
- http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd42f7512f---mifobanegojoxi.pdfIn PDF document text
- http://nessium.fr/userfiles/file/90124940556.pdfIn PDF document text
- https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/c93342368e7e52ba24f8904f04b7bc29/gonimatabejipobosubek.pdfIn PDF document text
- http://dataction.org/demo/dataction/media/25164144358.pdfIn PDF document text
- https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cfa4d58fb---60144816808.pdfIn PDF document text
- https://proxus.nl/file/29260770346.pdfIn PDF document text
- http://stlukesmn.org/clients/17773/File/jofobuvitipixagu.pdfIn PDF document text
- http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xilokofupugep.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c322ee5ef---vuzidib.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_off0000f17b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF17B	11208 bytes
SHA-256: `d90e957f73fa3a37d4de5bc072f7d71c72d79ae68b93e047324bd44d30daad1e`
`font_01_sfnt_off00010b61.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B61	16480 bytes
SHA-256: `76dc7f8b48c5c132c303d925c955a23291fe262d41fa33c8225a406a694320b5`
`font_02_sfnt_off00013611.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13611	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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