PDF malware analysis — malicious · 0a544dd5b3bf8631

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 22:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 042a52c6382c8b706730e55dacd613cd SHA-1: fa3e5587a6dd9fbd03bd83e985ba26175b8e4eb0 SHA-256: 0a544dd5b3bf86316f426780d5190c15b81217ad8b75295838a5b74be48dea7d

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. These links form a link farm, likely intended to redirect users to phishing sites or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://synerhu.ru/uplcv?utm_term=chrome+mobile+app+download PDF link annotation
- https://alshaabcoop.com/userfiles/file/fujejajubuj.pdfIn PDF document text
- https://taumed.kz/upload/2021/09files/210918144359454431cx2ja.pdfIn PDF document text
- https://fpcofmacon.com/nbloom/fckuploads/file/bitozomumifepotu.pdfIn PDF document text
- http://musorcentrum.hu/files/article/file/106729115.pdfIn PDF document text
- https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/tomeverax.pdfIn PDF document text
- https://burlingame.com/wysiwygfiles/file/revafozuxuvakenal.pdfIn PDF document text
- http://fabriquetextil.com/js/new/fckeditor/userfiles/file/94208664448.pdfIn PDF document text
- http://anais.terminarz.online/kosmetyczka/krakow/files/50763243912.pdfIn PDF document text
- https://parlagame.net/calisma2/files/uploads/43470204039.pdfIn PDF document text
- http://studioarchperissinotto.eu/userfiles/files/pesixovamam.pdfIn PDF document text
- http://boldino-hotel.com/ckfinder/userfiles/files/lebot.pdfIn PDF document text
- https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/e6ev24far9v27ndvmujtark7f5/12261947955.pdfIn PDF document text
- http://kfnmdg.com/upfolder/e/files/20210910093836.pdfIn PDF document text
- http://ahkkpcm.org/userfiles/nilerajovewit.pdfIn PDF document text
- https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c667e57b20d63b6f091aa4618412ed9f/18762534656.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3f081e686---zomawujibulamisokasadiv.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f077874371---33619556670.pdfIn PDF document text
- http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161408df6d2991---remizeniwolage.pdfIn PDF document text
- http://snap-drone.com/userfiles/file/50356670072.pdfIn PDF document text
- https://tradingphrases.com/userfiles/files/86659104011.pdfIn PDF document text
- https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d4f3f33e221325b7704f60bfd4db1380/xebejoxiruvasojomuripagi.pdfIn PDF document text
- https://observatoire-omic.org/documents/file/81148989225.pdfIn PDF document text
- https://asken.as/bilder/file/3532939333.pdfIn PDF document text
- http://cuboni.com/uploadfile/hong202109190823429443.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_off0000e007.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE007	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f81e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF81E	10648 bytes
SHA-256: `08bacf4196aa5e2a5286d96c8bdabe4fcc36e855d75435e0cfcf8a9f5d3a64c9`
`font_02_sfnt_off00011011.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11011	17924 bytes
SHA-256: `b8b71013b99d3838759e0163a84398901c4101f793ed83664b8f8ada46b72db7`

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