Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1bdb543a7858a31…

MALICIOUS

PDF

84.9 KB Created: 2021-07-21 04:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 221348f714c6ab1e411c035404563b62 SHA-1: bec8e9f7496d9ae2aff06fe186a4c46f7b9bcbac SHA-256: e1bdb543a7858a310e48eb00665d9a1879cf15a26a5a72e789f9a920a499d3c9
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous links to compromised CMS upload storage and disposable hosting, combined with a heuristic for a visual download button, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fb6670a1a---viravelufewifudap.pdf In PDF document text
    • http://campfirewtx.org/userfiles/file/54413508396.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/josena.pdfIn PDF document text
    • https://tonitomov.com/picture/file/batevemoxaxos.pdfIn PDF document text
    • http://daebokjungdb.com/uploads/files/magadapidokawa.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/xamoguzamuwisamedosikofe.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/9806236458.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac460565bd8---lemosuzofatuvijiropazed.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/48031413593.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/juponobonegaradoralofonax.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/jigejatozojotobifek.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608553db99981---39398374388.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/lufipexa.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/negedo.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/43372499277.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/p1f826tshkedefaqdlv0ku1lo0/bafawalewafusi.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/kowasagokunolanejuzu.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/logimeja.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/sipetagijunibe.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/72700729512.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ihqsf5qtlldag8tn72f624mkak/42508967660.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4938be200---pepalit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=astrology+for+the+soul+freePDF 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_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 17056 bytes
SHA-256: aea61b735d19d0781ff7f5040412adebc17faa7839be3f294c770eac74710b68
font_01_sfnt_off00011502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D19 10332 bytes
SHA-256: 9050e6b747a07f73843a243b01ae4fe865b007d77b240bd455065023de20c1ed

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