Malicious PDF — malware analysis report

Static analysis result for SHA-256 259c2ff2fa056a19…

MALICIOUS

PDF

96.0 KB Created: 2021-08-05 22:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0a482c67dfe9a602215a42df6d98e3c9 SHA-1: 48064d445e059b5186d723768ef3316c0b1adcd7 SHA-256: 259c2ff2fa056a19b66ad85a0f9f861e71109299b87df08abc6e77c07c45ee1f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=what+is+shelf+life+expiration+date PDF link annotation
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/60374017930.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/5klballef9pb3jfa744m83avr4/buzeropalaxan.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/nenadewanigonezebo.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcfd0cd0cd6---25744309545.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1f5f5bad2---xifobowezuxububiz.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/boparasulodugesufitesi.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/63889853532.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb3d3c2b54---13693590298.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/8556521721.pdfIn PDF document text
    • http://dakmet.pl/upload/natinupatopobanudaj.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/tugavukezukubosive.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3e90777d1---bijufagagikeferikeza.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/lidosifo.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/faziwudedowopowetoguk.pdfIn PDF document text
    • https://nadamasristorante.it/file/83275113723.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/23057880816.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/64af564617d2cb721fd20ed0a125a968/joxubozedidekono.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d3e986ce4---61048053789.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/37756573526.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/obvido2man4uaccr9llj8a77q5/jububikiwuduxusurowod.pdfIn PDF document text
    • http://chromatographvials.com/d/files/xagutisux.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/81533994868.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/waxigimuga.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/92980781125.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/57553918444.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_off00011353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6A 10688 bytes
SHA-256: 6533e4a8c41d3b0b8f7f050735c960724008ecba1fa854ab4d816ee9781fc06a
font_02_sfnt_off000143dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DD 18624 bytes
SHA-256: 225b145b29e5ceb3cec2a91c31e037cf37ce34e7a6f1d9d0bdec42d7203d363a

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