Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11e11f0a7fb1478…

MALICIOUS

PDF

86.3 KB Created: 2021-08-07 12:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 87ae87bdd6b5afddce685ad64aebffba SHA-1: 041ed1e1d65216d8c2b7d4cc67b8bd8db677ca5e SHA-256: c11e11f0a7fb1478ee00a026ec36680428961443b540c937fb1f24d48be12e52
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9994

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 https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/add7a65bd065b137690e321e4e636cf9/46365959495.pdf In PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/xiguvujenejasusuronojifa.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609494f6cb460---polefopelilaxogevusobofiw.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/woronotijuvefezaxigilo.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16079c61275522---kigarewamuxeziw.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/98129860512.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8d35b72e7---rojipugijofuzul.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2b007278e---29663423690.pdfIn PDF document text
    • https://technoray-medical.com/userfiles/file/bekifovobivage.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9da88dfbbd---mekowejule.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/29299110988.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/38558435014.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/riruxozotobesomulu.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0f382912---wurinovob.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/21411647375.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/tumukigoromu.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/4vf8htk4qmmjtf9ec6rj1hfc2v/5908202574.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/kojareja.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/52fad8d859a154623ec5f5a485d0f611/xirunufikoraxewotir.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/62665884533.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/48996993257.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/k0fvu9p4mmgf89j0dd487t61jj/39602095551.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea380c06f4---datefizaraderogufif.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/25174095501.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/35524626173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=possessive+pronouns+worksheet+for+class+3PDF 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_off0000ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 17320 bytes
SHA-256: 6798352d55f2263c0259141ea5409de6b520a6fb667cf78473254c68367d48da
font_01_sfnt_off00011714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2B 11092 bytes
SHA-256: cf75126b442162cc4685808fa84011c3580aeb3a75d8d4a1716ebee3fa76cd7a