Malicious PDF — malware analysis report

Static analysis result for SHA-256 212a16168474d6fa…

MALICIOUS

PDF

94.3 KB Created: 2021-09-16 11:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 998cae2406f571667ec753c24f38736b SHA-1: 984a8a71bb7c8663d4f77e2e01badd85d173efb1 SHA-256: 212a16168474d6fa8104752f212ffac6f5c11f84d9c21ac33d7ae8ec280711e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. Heuristics indicate these links are used to distribute content, with some pointing to compromised WordPress uploads. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/49479314827.pdf In PDF document text
    • https://majubesar.com/contents/files/satovodapemofukotoja.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/35779726355.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c670ea310---57292257581.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/zozalezagejivetapagusefub.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/76749499217.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/68690211318.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/81012194669.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/pibibijuxedosemetudipom.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/2008a9d0a239723458fb97988c0a1aa6/jesidevix.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/41610109511.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/59370536814.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/zetigufetamori.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/61498783875.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3dda2023a---83081326255.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/vodonisifedojuni.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/18543518086.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/38947809714.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e935d27913---jelejosadug.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/gewetipufarolusafiwadag.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/28141499771.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210904032713.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/55598518475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=harga+hp+samsung+galaxy+grand+neo+secondPDF 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_off00010929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10929 11076 bytes
SHA-256: 04f973f3424309a1da93679e6e5438ab7cbb5d84b2fc910bb024ad61fde4814d
font_01_sfnt_off00012291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12291 18648 bytes
SHA-256: d8c1963b5bc37366971aa47e756a6665d926fde22ed06702efdf8913a5b017e3
font_02_sfnt_off00015311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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