Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef405887bf309b1…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 13:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 92e59b3241e6a60a730faccddd3264cb SHA-1: b82d7d1c7ca61b8f559f0bb250573d1e4ed4b83b SHA-256: 1ef405887bf309b11e328cc118701496685a51a5466327e14e5d0501ea010370
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of these links and the overall structure indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/wijavabofexigidobapipaw.pdf In PDF document text
    • http://www.physedu.in/newsite/userfiles/files/96069790247.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/83010423789.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/70772502185.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/mazomawoxarelazem.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f302364fa41db835f1cd6c4a2def4fec/33320429231.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/78444316791.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/posoxotaxunutixuz.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/45850636174.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/81204163691.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/37542496761.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/bejuwifugiwobedax.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/lebosepifisanupug.pdfIn PDF document text
    • https://ibextrail.com/editor-images/daxowikave.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///71266685841.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/waniradosobasumegebubi.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/36635144474.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/12957169710.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/29556daeacfd8ddfb9344bffaaa1bf4a/jenatevikivoxetuvusu.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d427bee6a4---30223785312.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/75017775356.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/disilupudoxuxepiwexofo.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/rivagebisenovemobekevo.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/xirofaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=single+player+rpg+iosPDF 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_off0000b2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE0 10520 bytes
SHA-256: 89b90e216701603151cc08a2bbece100cade47143850071240510fe963a6c459
font_02_sfnt_off0000e2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 14932 bytes
SHA-256: b00af58e2dd37ab7fbd189d53275e3fd1d5519573c39344cf9a6cd75f2880fe2