Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32e2519d00d9446…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 22:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71148c4784a5fa4ac324c62c2c5689b3 SHA-1: 6b21d5aab5c532e906cbdfafe4255bcdb7387ad9 SHA-256: b32e2519d00d944675b5b750ee79a7e6a5aabc0802a968d5d4bedaa2e167ba96
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to domains that are either compromised or disposable, suggesting an attempt to lure users to malicious sites. The presence of external URIs and link farm characteristics strongly supports a phishing or SEO-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://koreaseowon.com/ckupload/files/tobuwutuvusemanifetivix.pdf In PDF document text
    • http://falerisztika.hu/tmp/88794645435.pdfIn PDF document text
    • http://actinq.nl/upload/file/34258751118.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/bepozi.pdfIn PDF document text
    • http://rilta.net/userfiles/files/64733211769.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/gizobebif.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e5f5c6aef---julovuxatolu.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/mapizivomik.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/63568545067.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/vokesepuk.pdfIn PDF document text
    • http://landia-print.com/pdir/file/vimomeroweniwulewotokimuw.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e02b4d5069---46387743811.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/vupusewesipozedidezekexer.pdfIn PDF document text
    • https://cardolf.ro/files/18415763996.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/61083798939.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/3836079387.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/5792690442.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/d636d5e1a275a38c8c85a3f6161a7825/mazogokakewopofoniz.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/kabogur.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/07/file/33690432579.pdfIn PDF document text
    • http://cosyromania.com/media/file/78621422136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=threats+to+temperate+rainforestPDF 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_off0000da00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF217 10540 bytes
SHA-256: d71accf93fe28983cdb65667617a7ac4099d0cd5344d3c28cf66e2b2fc403eb6
font_02_sfnt_off000109ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 17544 bytes
SHA-256: c3f8ac4d46cd691883ba922d9795907db7e031944870801edfb8da25eb9e5484