Malicious PDF — malware analysis report

Static analysis result for SHA-256 c265fa3dcaa95b7d…

MALICIOUS

PDF

85.0 KB Created: 2021-07-07 11:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8a2a4532a78055cc509866a0e580e062 SHA-1: 27a445cab52279b451a02bc9f90ef01d3934515e SHA-256: c265fa3dcaa95b7d871d025d2352e46200d91185a0a90f59ce8fcd2564bdfd8a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external PDFs hosted on compromised websites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing attempt, likely using a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/4df69c1c3971cc992f02652b52a9cfe1/jujowuzasobenumoxesomane.pdf In PDF document text
    • http://changrung.com/ckfinder/userfiles/files/65792634432.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/41100cb4e2e03e18cba931f83ab8f276/98068477562.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/remapagozox.pdfIn PDF document text
    • https://fallsplat.se/file/lubalimalodolasun.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b06850f3eb3---36266748627.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210701055845_NjcxODkxMTM2Mjc=.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/d307ffee98a7c924c31324d4386f93f9/69008770536.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/73785313488.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f0aa753e999b1fc33a038537e698d076/47684140456.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca0e27d960---lajezupezokujeti.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b2c44f3d4---kidilotefud.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073035626241---xilereximudixi.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/riweni.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/3c114fd7e61a306e71e678a18d4c3d1f/19894173072.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/40420237541.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/94067262498.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd358a8280---30353476684.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/gukarimezexuvabanaki.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/pomidagamepejowaf.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/20899418662.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736ac719920---13406186957.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b149bbe0ed8---falawudisisudis.pdfIn PDF document text
    • http://novafish.it/userfiles/files/jabiweworisawudov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tube+mate+latest+version+download+2020PDF 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_off0000e7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC9 11008 bytes
SHA-256: 4cd399362f9a185c48a6e959ccc51c4821d492be9740a718f24f333a1c8e0f33
font_02_sfnt_off00011969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11969 17332 bytes
SHA-256: 46480a52d053d69b2c13c11358a8b93547c93cb1dfe08b60a77dd2eea5e6c622