Malicious PDF — malware analysis report

Static analysis result for SHA-256 5678be9cb29eccf0…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 05:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8708a0f47fae7e1556059bdebcf3f5df SHA-1: 3e397b9224024716376aa718ad8e20aeb36fc197 SHA-256: 5678be9cb29eccf09e4f7acb34421e03f13b55ee6010c6e4dc3e847f47485a79
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of external URIs and link farm heuristics points towards a tactic of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=snake+rivals+apk+mod PDF link annotation
    • https://mihalex.by/files/files/solikos.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/pitomonamolo.pdfIn PDF document text
    • http://trevorhannant.com/34215921980.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/73256632232.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/mofaxodifexirogupasuw.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/38431253462.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/72670155772.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1b9c9f0b00b047f6c86ba33921d5fd4b/57962196923.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/zogofefokemanezikuv.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613557db321de---vakidusinovalodepek.pdfIn PDF document text
    • https://upaspor.com/resimler/files/60498291989.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/26540145674.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613682d7dbd7c---wafemamokoxona.pdfIn PDF document text
    • https://digireg.nz/upload/68406306111.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/84680530856.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/puzese.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/subaw.pdfIn PDF document text
    • https://noventa.cz/media/files/file/34365734659.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/7232407802.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371c0534cca---voxawuwiw.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210903110730.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/82424271663.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/xifivuvarevababojazom.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/70575956dfc273d618e3baa810445e14/98474112673.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_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 17308 bytes
SHA-256: 5af092d828663acbbd651f2bf68a7e8388bd4a7f1bb8cbcddeb9acd8f45a38c3
font_01_sfnt_off0001070e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F25 10688 bytes
SHA-256: 1dfdc69a6f43a2ee7a9496d1b530a162b37419aba6995b44f9dd6ef621504f3b

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