PDF malware analysis — malicious · af690a7bebdaf144

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 22:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29

MD5: 7916f446920de20e184ead9d37b99e7d SHA-1: 4d9529d58017880ffd7d5701b116e9376f6842a0 SHA-256: af690a7bebdaf144acba8b5a40948513b8c56da45c04888a039c5dbf56ae4d17

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. These indicators, along with ClamAV detection as a phishing trojan, suggest the document is designed to redirect users to malicious sites. The embedded JavaScript likely facilitates this redirection or further malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://crysiq.ru/uplcv?utm_term=alejandro+casona+la+barca+sin+pescador+pdf PDF link annotation
- http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/perekuxusalunimexur.pdfIn PDF document text
- http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c8fff565b3c9ac874b7b99ffc959a276/46139344749.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a32aa8232498297e3a3d71f41bbd7c9f/84569888297.pdfIn PDF document text
- https://reaga.net/js/ckfinder/userfiles/files/sosegirorutemako.pdfIn PDF document text
- http://uci.ir/userfiles/file/mulogo.pdfIn PDF document text
- https://zemiigori.com/uploads/file/80431201166.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e04f1fa87ce140d061c4296da6724a56/84400500410.pdfIn PDF document text
- https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/84151bc6698aa7ba07b6e904d2c9c2b3/43588211391.pdfIn PDF document text
- http://viettelhaiphong.me/data/dulieu/files/gafojurigezuneres.pdfIn PDF document text
- http://sarljarry.fr/userfiles/file/80563937165.pdfIn PDF document text
- https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/670e1010dbd10f113341b7370da13008/66683460668.pdfIn PDF document text
- http://erh-hu.com/userfiles/file/josokibifu.pdfIn PDF document text
- http://inarchengineering.it/userfiles/files/merelo.pdfIn PDF document text
- http://www.valathors.com/ckfinder/userfiles/files/97844770376.pdfIn PDF document text
- http://exito-opakowania.pl/userfiles/file/96933559478.pdfIn PDF document text
- http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a32513c7c0b---numasewim.pdfIn PDF document text
- http://hzzxtl.com/UploadFile/file/20210716101046619.pdfIn PDF document text
- http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a370a1aeae4---48620421015.pdfIn PDF document text
- http://aapltd.net/userfiles/file/4515615235.pdfIn PDF document text
- https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/9phh4fjvg1qviub9l2o5o7hn9m/zononidexumofujot.pdfIn PDF document text
- https://lacausedeslivres.com/userfiles/file/17791434837.pdfIn PDF document text
- http://jiin-torng.com/uploadfiles/20210811001248.pdfIn PDF document text
- http://eltdb.com/UserFiles/files/90601374588.pdfIn PDF document text
- https://www.posluh.hr/ckfinder/userfiles/files/83936087224.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_off0000dd6e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD6E	18788 bytes
SHA-256: `b7a42161c9a9b84f6e784282b961fd93048a46b009aedbc32b7671ea8a29a4e6`
`font_01_sfnt_off00010d6b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D6B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012582.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12582	10764 bytes
SHA-256: `79489549f2a7c9a73c4e31dbb0f0671a4d09c2d093ced9b0a735ece0e71598f0`

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