Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c31b84aae26df12…

MALICIOUS

PDF

76.2 KB Created: 2021-09-04 11:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 3f83b004550e5db1f902b313899fe410 SHA-1: beca620cddb495ea7c6150aa6a0faf5056dfe96e SHA-256: 3c31b84aae26df12283a76ebfe92dc622152201216fed22f0fee054b374388e3
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d4a569c88---61971166034.pdf In PDF document text
    • https://rjpexport.com/files/setikudulejowakatiluxem.pdfIn PDF document text
    • http://schokozentrale.de/idata/62661269864.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/35204189920.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/14378779877.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/joripaxinunikadizu.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/pelez.pdfIn PDF document text
    • http://parfumland.sk/upl/47476605369.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/788b4e315c017285798a27873a7abcf7/nokenigawisetepi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac45eca163---veposafiwak.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125f68b4eee0---vifabexaruluwosonokerukup.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ae464a4c---62372128902.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/jodegowetofizi.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/9b6a89b105ef73285de7b33ce444e80f/39699024335.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/25148839544.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/821efe1189a3ce0d77fee3ce9555e6cb/kufonibu.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/xoxamawikapitovew.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/zafubug.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/66656622337.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/vomiginaxadosipej.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/tisikubopebabolakix.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/516169122203cf9d99b1fc1bef895829/zeletimetogevosatami.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/vujod.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/tobiwawogavumogujujib.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2854850399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=possessive+case+exercises+worksheet+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_off0000c417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2E 10912 bytes
SHA-256: 96182724bbcef6f99059dff9fc1c44daccb885bc0c94407c611361cbfd498c34
font_02_sfnt_off0000f5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 17288 bytes
SHA-256: 12d652e072ce4c507072377ac0a582211aeec4e788eeefd9fe26dd62a5f5c254

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