Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca140098a20ee58e…

MALICIOUS

PDF

86.7 KB Created: 2021-07-22 05:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: d929577b5a887bb000730cc99460db4c SHA-1: 87567c5e1fb40918d063601977fa6f3ef75c6c1c SHA-256: ca140098a20ee58e1a86a8125e2b7e535b94a9cec2ae05b8f3dadacedadaa599
196 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 document contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, and includes an instruction to disable security software, which is a strong indicator of malicious activity. The embedded URLs suggest an attempt to lure users to download further malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a154e6a8a6c---kawurug.pdf In PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/6554469e4ee970bb93c5b0b87aab78d0/94469066551.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/rdag6o898i9m2cfjprcp01qjj8/moxepudozisemejavavi.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/79da2b1f02492faac550f107b44b8b10/91789885229.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/metagigiditerur.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a34886ddbc---leluzodixox.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/xajefone.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/91611440247.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/57383314987.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608baadf36a5e---kasetad.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/otmflpjgal8j4g1lgi9igktm99/waxisutefozuw.pdfIn PDF document text
    • http://ave-france.com/pics/files/vosulejexajomegokos.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/21859333718.pdfIn PDF document text
    • http://aimic.com/userfiles/file/29211300719.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/ba303b98170c4dae115f8e1d5c1b2819/81860461752.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c032b87f1c8---bikezoteso.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0cf3735d9---makevatujiwifan.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c66fe717b13---57691103510.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074124cabbce---lofese.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f226434d678b554fb0da037441abb562/zagofoloxeka.pdfIn PDF document text
    • http://aweibel.com/Photo/file/91196292714.pdfIn PDF document text
    • http://billsky.ee/files/file/97494219758.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/7ec3e6c9cc9e5983ed574baaeadf73ac/fasizebapibasevakona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=there+was+a+problem+while+parsing+the+package+solutionPDF 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_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 16660 bytes
SHA-256: b594296cf3b68153ef888ab92d8419d244601dd6be3a264e8075cb5f12324320
font_01_sfnt_off00011ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC2 11200 bytes
SHA-256: 85206824763bd2170d701998a945649992a184c140b05e2ea82a54a05d800861
font_02_sfnt_off000134ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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