Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e2c097a61f030e…

MALICIOUS

PDF

82.7 KB Created: 2021-07-13 14:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 97e32b40d866ae6f5fc6584c25813ff9 SHA-1: 19c38963485dc5ee503c5e4983670729e90c3eb9 SHA-256: 39e2c097a61f030ef4f6f2d9ef83225acd341ee826c05fbfff6e791edfa25592
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories or other suspicious domains, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious websites, possibly for phishing or malware distribution.

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://csodamalom.hu/files/files/19928982133.pdf In PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/m5c2cn8r7k059jk25caq0ce9gi/xidibidixopemife.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/demivefudepawonureza.pdfIn PDF document text
    • http://fittbikese.hu/files/file/31097593108.pdfIn PDF document text
    • https://dm288.rs/slicice/file/36577018896.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/47146317669.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/bml2tfeonbc9idi5tht4gn7n45/punewifelovexoxisabi.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b50da2094eb---vibevedarowub.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/2a8b3eb60e46bf21d405a9ee8e4ca439/wijoxu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd1fd28c9---vonabipukegevamimuzov.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vegejut.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/warovi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/r7ccb65e038mfr2b589v5qe9k7/pijoraxezogetilifoliw.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5c85d7c5b---56067505187.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079066f5d1c4---90822337961.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e29956148de---pakititafifexajubu.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f459b1297ca398b0f13929d884972da4/sikefavibexibuxukeze.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/pibemigaxu.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/depupenorenazolol.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/sopiziwu.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/13179175138.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/377bf7d2f3bdb90de0574695a9ad5925/28818519019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=student+attendance+management+system+project+in+c%23+with+source+code+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_off0000e01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 11228 bytes
SHA-256: 25cc212034401f9b15703eb0a9b4c76e37983d17b6233fcf432b455a936076ed
font_01_sfnt_off0000fa33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA33 16476 bytes
SHA-256: 994afbbb7e0f17547bb553e9de4f66a8c50ce6512e97257799dd1cdeda147401
font_02_sfnt_off00012522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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