PDF malware analysis — malicious · ce4887a3f0a8dff4

MALICIOUS

PDF

83.6 KB Created: 2021-09-21 05:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 99b11eed668dd5dc6c0f689807c835b6 SHA-1: 5338ed7f79be24147dc283ea9163218bed44b9bb SHA-256: ce4887a3f0a8dff4b19d731945598763a43b333417355754cd55f9d167c11e29

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

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.
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://laborke.ru/uplcv?utm_term=gta+san+cleo+download PDF link annotation
- http://sino-web.net/filespath/files/20210902153258.pdfIn PDF document text
- http://lakesnwoodskerala.com/uploads/file/79492206517.pdfIn PDF document text
- https://clifestyle.net/uploades/userfiles/file/wisufix.pdfIn PDF document text
- https://jatransfer.com/userfiles/file/94926346381.pdfIn PDF document text
- http://atoutslegion.com/userfiles/file/86564378645.pdfIn PDF document text
- http://aptekainternetowa.net/_mdm_apteki/file/jawomekopetid.pdfIn PDF document text
- http://csc-0411.com/userfiles/file/20210911094534_mspgbt.pdfIn PDF document text
- https://vibanghanoi.com/uploads/files/gexowasiwivirofavutaje.pdfIn PDF document text
- http://tecs4.com/intranet/ckfinder/userfiles/files/9322518171.pdfIn PDF document text
- http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ac448bef8---siwiwexinivas.pdfIn PDF document text
- https://bestrecycledautoparts.net/images_i/file/41272722291.pdfIn PDF document text
- http://dentalweek.eu/userfiles/files/dusowezudubuzawusitumojo.pdfIn PDF document text
- https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/af37079365f4068ceb405b5bf0d04658/lusejadotoredusedukif.pdfIn PDF document text
- https://xn--fct8ml6mwue.tw/uploads/files/51974320888.pdfIn PDF document text
- http://dongphat.net/upload/files/xatubaxoxuvito.pdfIn PDF document text
- http://netflor.pl/upload/File/9578534973.pdfIn PDF document text
- https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/narabiwubotajugasebef.pdfIn PDF document text
- http://carrozzeriabosini.net/userfiles/files/39593347672.pdfIn PDF document text
- http://tochuchoinghi.org/files/1902699345.pdfIn PDF document text
- https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464fc3993a5---94715431901.pdfIn PDF document text
- http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8a9b6d4d---wawenejipalomezonalas.pdfIn PDF document text
- https://viadagio.be/userfiles/file/422995806.pdfIn PDF document text
- http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/kexebisufigibigumebo.pdfIn PDF document text
- https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qgh958m5h25ss7l8rljj01bm7q/gamebigebozedefakanosulad.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_off0000daf9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAF9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f310.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF310	10296 bytes
SHA-256: `1c5657f73a0d4ae0d7de5e8d8111ed3d8828d8f558c5bd2520c2d410bdc89c42`
`font_02_sfnt_off00010a7d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A7D	20588 bytes
SHA-256: `5a5c6855774105f6da2fce23695c540b20cbd877d68d4a9605881385eeaed89a`

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