Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c5c45badfd2333…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 21:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b2bb5e31a9b537f346b330aff65de844 SHA-1: 8ef2da7f44040dc4f443777f75fa9581054a47c0 SHA-256: 65c5c45badfd23334b4f9c37ac98cd34a77f9471ceb12650ef3fd459f990d345
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links are hosted on compromised sites. The embedded JavaScript likely facilitates the redirection to these malicious links, aiming to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://winso.tw/userfiles/file/86739166249.pdf In PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/6497859900.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/13812250557.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/dunovaxepilawepunimufibid.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/xedawefofu.pdfIn PDF document text
    • http://uteambio.com/upload/files/17181654868.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/75720276038.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/6209824814.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/fa8c56d843f71b4700b833fb95dc273f/xaleraruwofadexiravup.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/5524690963.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/9787286884.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/tumibirako.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/28295613509.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/xegezekojokofebapagasazu.pdfIn PDF document text
    • http://gr-chem.com/upload/files/76139491708.pdfIn PDF document text
    • http://sentralperdana.com/file/fitomepalapi.pdfIn PDF document text
    • https://activepymes.com/pub/file/pafenasubabel.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/0ec297648c2540c068cbba628502b8a8/54538958386.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/ximen.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/gewuxaxaneda.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161393ea9e3b75---bopafasujokuwulutagesixe.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/17150716905.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/tivisukasifagejudukoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=why+are+ads+appearing+on+my+phonePDF link annotation
    • 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.

FilenameKindSourceSize
font_00_sfnt_off0000d730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 17616 bytes
SHA-256: d08d3b270b6b9f07945ae769304aa9bf18f33b6a3a5065d52c3f5f76c65be2d6
font_02_sfnt_off00011ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE2 10804 bytes
SHA-256: 56193eaf035d87cd21fd23565958ae3835922f4290e0ee4b48eb08d624527e35

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