Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78f8866149532ba…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 09:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d0b2add70d3156577d5a95bd0ce78064 SHA-1: 4dfb82b76bbce37a6aafce518a0a22e92a82824b SHA-256: e78f8866149532bab0a5d2c49537dd454cbfb37cbb98dd85ba5bc1bce1a99fdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://oniceh.ru/uplcv?utm_term=best+phantom+skin+valorant PDF link annotation
    • https://thisissati.com/userfiles/files/pevenasisovimaw.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb17a6ec3---jamudorad.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/46354674306.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/01c551be3dcfae993f63d411fb418ac9/71234002409.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109261916138297.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/85694847961.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/dubupevon.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/vizisapopojex.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161354a6be7241---varuxufezilili.pdfIn PDF document text
    • https://schmitz.cz/res/file/zapidomoloweravikakanexig.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/52480348033.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/6ibj77dhjac3b70bqh87e98ouo/zujibimaline.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109062038178803.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/gogewawaviluwedopi.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/kutekenon.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/wipiziziwosexolow.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/xegibox.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/mlbc1ma060dspm74kpcdk7ji71/35613136197.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/8114308411.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/44325335412.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/wakudijotutafufirum.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/eaam4ijnm94goqr0ema2mqa6b1/35489404105.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109150608295474.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/wiwulonon.pdfIn PDF document text
    • https://viettrungson.com/media/Files/rujojumomisirebojuru.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/dedamin.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.

FilenameKindSourceSize
font_00_sfnt_off0000b31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31B 10728 bytes
SHA-256: da2f715ccf3e77fc5507ccb19c332691e30db20a35d82facb09c5ca01b5aa326
font_01_sfnt_off0000cb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 14628 bytes
SHA-256: 7728e17ca72078fe0e70420bed03274f5c69993cc7dde05b9a5338c56d5d48ab

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