Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3969c45f03c582e…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 01:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d03bdb2875dbd59acdd088aebeedf3ca SHA-1: b11b7ef2bd68966c23a5f56f05001e8fcb0767a8 SHA-256: c3969c45f03c582edf6aec095170457c1625d44fac9c3099f5fa0fba305cbffe
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, many of which are hosted on compromised WordPress sites or disposable domains. This pattern is commonly used to distribute phishing content or redirect users to sites hosting malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=bose+noise+cancelling+earbuds+manual+pdf PDF link annotation
    • http://walker-doss.com/clients/4/45/450b4a4af5ff3f13851793278d9c7ef8/File/66799327478.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/8af7d04b642e051c25a56b53ff75abb0/42130955510.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/92273300350.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/sabaroxixoluj.pdfIn PDF document text
    • https://fptica.ru/images/file/bowupuxupazifa.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7b1c74520---kowijilakekukuraratij.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b9340052215085421e4d2c5e8b3f435d/xifejosuxogibiloge.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/zamudix.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/51736989668.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/fca7b4f05e17409c97906fe25810b3c4/83888020991.pdfIn PDF document text
    • http://renovator.cz/files/file/63585680628.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/85647940527.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160afd218e87a0---59266893490.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/1bef4e6e990abac0ab8104d9d70cc900/pixaxaruragi.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/xiraselo.pdfIn PDF document text
    • http://asustainable.com/global/file/29229994172.pdfIn PDF document text
    • http://a-xian-coat.com/uploads//files/202108031801568995.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/10547871457.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/p5grkak84a6ggg77c3pdvdtk60/bunesufipa.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/51728393348.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160815049a5854---81698365410.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/22d91656886246d3a128a5b061e59eda/48002379487.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/12160032529.pdfIn PDF document text
    • 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_off0000c6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B2 11156 bytes
SHA-256: 2018894fcb0b9d1f5899e02cf6acafba772cd1d6efa49adb7dc36dcad3a0b3a9
font_01_sfnt_off0000e057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE057 17032 bytes
SHA-256: 8038b34bb9cf171f96ea021c6ef68e4efe2a8fbf22f4e8f141b11ad7e0b5cc48
font_02_sfnt_off00010c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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