PDF malware analysis — malicious · f78b27907519a87d

MALICIOUS

PDF

85.0 KB Created: 2021-07-05 18:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 49f67dfa9679736fff0250104a453bf6 SHA-1: 3448047d6cceeef283c524461e516174953cfab0 SHA-256: f78b27907519a87d7212f84ef0d4f0cda5e5d0566e2b821b44402416df4816ad

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers strongly indicate malicious intent, classifying it as a phishing trojan. The file's structure and URL patterns suggest it's part of a phishing campaign, likely delivered as an attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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 http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/7aa61171d4b8e8d4757f807c40509bd9/refupedumowivifubi.pdf In PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/eddd9c3637ec733938ee1ac4a42f2fd7/bilokobasokiwelevuribiba.pdfIn PDF document text
- https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4d9599346---kidoninavitopatape.pdfIn PDF document text
- https://lawina-radom.pl/files/file/25800837232.pdfIn PDF document text
- http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab65eec6e58---29004974638.pdfIn PDF document text
- http://toshiba-center.ru/uploads/files/48009470866.pdfIn PDF document text
- http://trivio.it/userfiles/files/74842057278.pdfIn PDF document text
- http://showplus.ae/userfiles/files/52903533914.pdfIn PDF document text
- https://spiuruguay.com/ckfinder/userfiles/files/lupuka.pdfIn PDF document text
- http://centroolosprato.it/userfiles/files/47370703696.pdfIn PDF document text
- https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/0df5278c26d392aefef784c98e56d77c/lojetisurikalupekomajami.pdfIn PDF document text
- http://studio5r.com/userfiles/files/maloxotekux.pdfIn PDF document text
- http://tubietelbar.hu/uploadfile/duvun.pdfIn PDF document text
- https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b286b49fa11---78435493573.pdfIn PDF document text
- http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/gn98jjlcpssehh7tkh4ru0df05/48261489041.pdfIn PDF document text
- http://sys-svinding.dk/userfiles/file/17652017463.pdfIn PDF document text
- http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/h1bcq2c4t2sag8gronb019r5l2/wosefuniduf.pdfIn PDF document text
- https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887414e4f3c---54098336824.pdfIn PDF document text
- https://area34.info/wp-content/plugins/super-forms/uploads/php/files/a83cq5fs4bn3dn50lrtiihv623/60836936854.pdfIn PDF document text
- http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce0538b332---11847370991.pdfIn PDF document text
- http://lltsg.com/uploadfile/file///2021062813372217.pdfIn PDF document text
- http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072356a48747---goxuwonalazojijixebafo.pdfIn PDF document text
- https://floraplant.gr/FCKeditor/userimages/file/96117286785.pdfIn PDF document text
- http://anhuizhkj.com/upload_fck/file/2021-5-4/20210504073734236208.pdfIn PDF document text
- http://cdmatik.com/uploads/file/17537772424.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=calculus+by+larson+pdfPDF link annotation
- http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/12b7ca262186c3b0f5c564d7a447bcff/36255019852.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_off0000e8ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8AD	17452 bytes
SHA-256: `47c454b465e62a24a6a2c0eb50a562519d266a24532876a3302c7b7d81506c32`
`font_01_sfnt_off00011650.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11650	10676 bytes
SHA-256: `00d7cfa6cdbf26633ab4a016a2e7314c058d19c581efaca2bdff7df26f6beb0e`
`font_02_sfnt_off00012eb8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12EB8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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