PDF malware analysis — malicious · fcebb0ecac8e2ce6

MALICIOUS

PDF

94.3 KB Created: 2021-09-05 00:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: fa48bcf4a5220e1d1944501a4c72f3ae SHA-1: 1a44091acdee1ef38991ccc8ae2839868035d308 SHA-256: fcebb0ecac8e2ce6963b9d363538b96c9abcc884706417317a5a48ea6069ffa3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF acts as a link farm, with many embedded URLs pointing to disposable hosting or compromised WordPress sites. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9935

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://irlanc.ru/uplcv?utm_term=rivastigmine+davis+drug+guide+pdf PDF link annotation
- https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fac53cfe0e---32659096469.pdfIn PDF document text
- http://harchovyk.com/userfiles/file/fujorofasa.pdfIn PDF document text
- http://glavis.biz/userfiles/file/61649929513.pdfIn PDF document text
- https://destockbaby.com/ckfinder/userfiles/files/xopaseriribixexopesugi.pdfIn PDF document text
- http://e2ingenieros.com/ckfinder/userfiles/files/3856619694.pdfIn PDF document text
- http://douzonebnf.com/upload/file///23905893920.pdfIn PDF document text
- https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/054i2a6l5pijs47me9i1gg9sfb/51498155479.pdfIn PDF document text
- http://archinfo.ru/uploads/file/nadokizuzo.pdfIn PDF document text
- http://mini-garden.ru/userfiles/file/nubomunijixuvab.pdfIn PDF document text
- http://afghansolar.com/userfiles/file/zeponit.pdfIn PDF document text
- https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/854e2852402c1f5817b67281b7e45099/22437851896.pdfIn PDF document text
- http://thietbianninh188.com/uploads/files/31016493905.pdfIn PDF document text
- http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9fe76db09---6750278559.pdfIn PDF document text
- https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/fcda63a9b56eb2d77c2547fbfd06e8f5/4379227044.pdfIn PDF document text
- https://ietc-oman.com/userfiles/files/97345839071.pdfIn PDF document text
- http://problemconsulting.com/img/download/files/logebelon.pdfIn PDF document text
- http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/vigebiwumomu.pdfIn PDF document text
- http://ashioke.com/images/library/File/jemojusirodinesiri.pdfIn PDF document text
- https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af300853d3---mokafafosetidomimafoledi.pdfIn PDF document text
- https://srmresidences.com/images/bulk_images/files/zulukudonoja.pdfIn PDF document text
- https://anfauglir.com/images/file/sezinolimizujogajesabo.pdfIn PDF document text
- https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/591ecebb90a684954750200d752ed0d9/kijelilolez.pdfIn PDF document text
- http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076edc1b4445---60587159306.pdfIn PDF document text
- http://garmagostaran.com/Upload/file/17187560610.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_off00010931.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10931	10884 bytes
SHA-256: `3305031dd4500fdf1e7ac5a85a0ab222c99d4bff03a39cfa1dde3543bf66d7d6`
`font_01_sfnt_off0001222e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1222E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013a40.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A40	19108 bytes
SHA-256: `a959ad2e0c9b914d9c7f5c2a30f62ad3517388e55550de4c0b0228a600ebc040`

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