Malicious PDF — malware analysis report

Static analysis result for SHA-256 3addc103584acdad…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 18:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2ee2d92e163af9793d41bbecb793c1a SHA-1: b034bc266082532b05a94af451e03ac6398c3d05 SHA-256: 3addc103584acdadaf7064fa9afbbd33c5046b4a9cfe45fa087dc1bc77cd3cab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV heuristic strongly indicate this PDF is malicious, specifically flagged as a phishing trojan. It contains numerous links to potentially compromised websites, suggesting a tactic to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports this, indicating a deliberate effort to obscure the final destination and leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://znalac.com/userfiles/file/51438192312.pdf In PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a159e2360f---56487396735.pdfIn PDF document text
    • http://air-ned.com/uploads/files/98067446092.pdfIn PDF document text
    • https://penzehir.com/dorceiys/ckfinder/userfiles/files/8710667341.pdfIn PDF document text
    • https://aksusu.com/upload/files/29105043700.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/95580436725.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/76246234959.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/gewojelebizizaj.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210906215216.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/86328292921.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/97487290073.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210903222310.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418ee299fa7---nefefozukupi.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/pimomusegapepumozetoz.pdfIn PDF document text
    • http://infosierra.es/images/editor/mixuvarewuvolumej.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140c697b284c---mojewuledubalomoja.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/lexupatuwukalapanera.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/66220790899.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/40742468900.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/pemiwirupugomomopen.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/1f287747512f5467732bd089de041a5b/depazuzo.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614300c30df82---4286461982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=court+of+mist+and+fury+free+pdfPDF 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_off0000e687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 17628 bytes
SHA-256: b7dfce643268bfd309e32edf9783231bf590519c3183bccfc3b08e7f1a3cd45c
font_02_sfnt_off00012c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C35 10856 bytes
SHA-256: 613190ef0eb349628e64fbe7014ff84e82a3a3f524c91135347a633b6a84f2a6

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