Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6a0ba7317e116b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-14 05:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8e8a3e380f92e9096ec443630b2890b0 SHA-1: a2e2074c3f9b2143c4887372cb0398f2979d9c72 SHA-256: 3f6a0ba7317e116bc967df65f776b9f5154ff68179456ddcda006f4482332309
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate maliciousness, consistent with phishing or malware distribution tactics. No scripts were extracted, but the structure and URL patterns suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e457265af1---2467799624.pdf In PDF document text
    • http://bjbtrh.com/files/pic/file/bigazopowuxo.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdc38b10d0---50377570984.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/64474600023.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/48267321187.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/pumovifadekebojixo.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/bupopalatunedazodiz.pdfIn PDF document text
    • http://slsnn.ru/content/files/kexarupefujise.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/fikuvoga.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210901_213657.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd6d45c73d---45522656772.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/72423897031.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/43904138436.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/xipinekakododube.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/kewawutofusepopafesewonan.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/88053240968.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/wararogugexe.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/73542889512.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/ruxerosokarumitop.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133d63202b26---fujemufemidomu.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/gunukelimuvogorog.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/foger.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/7642784317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=memories+dreams+reflections+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_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 10772 bytes
SHA-256: 8286fbbaad850ecbf34dd6ad91d3c282660440a1ca5bf2679d1f0064e27e519c
font_01_sfnt_off0000f87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 17788 bytes
SHA-256: 7f1bbd40abeca7fafdc2e578efb038abcb9675c6de044063f3ed56f3075aaa31
font_02_sfnt_off00012635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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