Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc037a5d57383650…

MALICIOUS

PDF

89.3 KB Created: 2021-06-30 22:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fbecc4dd32469bf3ea29261c14dc3be6 SHA-1: a7ee2f9e16cf5bf62ea08f9034d75c4e4e4d0c8b SHA-256: cc037a5d57383650eccfeb50b6de9b43ad7bef0c8737b05b78bde53d12c05416
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress installations and disposable hosting. These links likely serve as lures to download further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2a1cc9a19---kisanugaduritagaza.pdf In PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b1dc5a560---nilowawusalomuwisitogobaz.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/83282518510.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c916dba3f---84424122042.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082d53628565---ludimalesezuwirolozu.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/20655471498.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/kso03pp8dqq5uo3f1488t93o35/54827524096.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/piwedenejisufenumosaw.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073749baf253---36562070174.pdfIn PDF document text
    • https://network-italia.com/file/6288077219.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ac86856444a---32069645209.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/wedenajubupupu.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/8611231150.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/jupuzipirubipikabegefave.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/linisirasojosepukiki.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/piwoxirabuji.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e28cfa030a4e5059374d584dc71a3f7a/fezipenarojobaki.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160beeecfd7590---86377015657.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/lagifapa.pdfIn PDF document text
    • https://tavio.ru/files/file/suridu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3b9e6c9b1---51678539450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=warrior+tank+leveling+classicPDF 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_off0000fa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 10556 bytes
SHA-256: 19dfc92096474baba0188964e59721d036c3c757738e2794af4ebb14f87a01b1
font_01_sfnt_off000112b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B3 17388 bytes
SHA-256: ddcee78aa76494b1b0ae7618a148409e270994f63b0bfc471d10268a3d6c0b51
font_02_sfnt_off0001403a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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