PDF malware analysis — malicious · 91faa2305102b845

MALICIOUS

PDF

89.0 KB Created: 2021-10-05 12:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02

MD5: 71a60da21d7b2f1a6175b9636ac7b0b3 SHA-1: 451ac4a5e2008dad33eec969a449358c5b94f08d SHA-256: 91faa2305102b845afa0cbd4dfbb52253b33f5222980f122017e754bda339dc1

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 CMS uploads or disposable hosting, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of JavaScript to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=ncert+class+6+science+chapter+7+question+answer PDF link annotation
- http://ativn.com/upload/file/2564386829.pdfIn PDF document text
- http://climtech.com/files/files/62260585975.pdfIn PDF document text
- https://cs168.tw/upfiles/editor/files/36803801652.pdfIn PDF document text
- https://www.algeos.com/js/ckfinder/userfiles/files/87654031607.pdfIn PDF document text
- http://strap.sk/uploads/files/vizunenav.pdfIn PDF document text
- http://aryajob.com/user_upload/file/44364531859.pdfIn PDF document text
- https://biserica-izvorul-tamaduirii.ro/files/poxeli.pdfIn PDF document text
- http://danies.ru/ckfinder/userfiles/files/2814872209.pdfIn PDF document text
- https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/d2ibb15oriou6j793rln2nu705/69470962633.pdfIn PDF document text
- https://zhongzing.com/uploads/files/202109150722297119.pdfIn PDF document text
- http://poaglasses.com/uploads/files/202109141245495794.pdfIn PDF document text
- https://phu-komplex.pl/pliki/file/nebedosokata.pdfIn PDF document text
- https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f65906a8e8---96600831561.pdfIn PDF document text
- http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615134b22dacd---14021892366.pdfIn PDF document text
- https://euforbiabulgaria.com/uploads/pages/files/gupovoluta.pdfIn PDF document text
- http://nsfeed.com/_UploadFile/Images/file/lupujem.pdfIn PDF document text
- http://burragebrothers.net/demo/jolie/beta/userfiles/files/jujusiganaxodudurakunexo.pdfIn PDF document text
- http://c2r.su/uploadfiles/file/2021100421143273499.pdfIn PDF document text
- http://osteriailgalloelinnamorata.com/userfiles/files/3835639148.pdfIn PDF document text
- http://terminsk.by/pics/files/70461855120.pdfIn PDF document text
- http://ahrestygz.com/userfiles/files/20210909_033407.pdfIn PDF document text
- http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615b7edf8e331---48913324259.pdfIn PDF document text
- http://malbreil.com/userfiles/file/70907011032.pdfIn PDF document text
- https://cakamuzejs.riga.lv/ckfinder/userfiles/files/79411194975.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_off0000f71e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF71E	11000 bytes
SHA-256: `3399e48e5138a92ccbff782a808110256978a46bf142da700169b24d5319eb28`
`font_01_sfnt_off000110ae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110AE	17976 bytes
SHA-256: `309b87d8774423b59422b6b9ffaea73f3cad8a392a2040ef843ad3588e89427f`
`font_02_sfnt_off00013e52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E52	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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