Malicious PDF — malware analysis report

Static analysis result for SHA-256 508cca5b7ede901b…

MALICIOUS

PDF

94.5 KB Created: 2021-09-13 00:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84761b353c0acbecab16b98d4d5ce0cb SHA-1: 2478dc4c2415173088db70783ac7ec1347fbc1b0 SHA-256: 508cca5b7ede901bb2d88074445fb8ee4ca8124c489beee78fa1efed41f479ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/430e66c3a9a18f2e7615ca0dddc32697/2607178777.pdf In PDF document text
    • http://freestyler.cz/img/file/dalowez.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/xosud.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/41602369851.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/mikivarubabim.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4c21277ae---97138898086.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/89285660983.pdfIn PDF document text
    • http://servmed.net/userfiles/file/liluxegom.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c80b253529---20851519600.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/82628832298.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/6c0dc3847dfdc685d7c4bf993a963a80/22711985536.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/dolotixepevobizatezif.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/wamunisamiki.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/44392373472.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/54796235342.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6d7f01a3b---54608196662.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/48609526903.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/zidatubusepezisufog.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/vozirupiziza.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/3357595676.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae32f1508---kemisilososavodovewog.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/zavatusinaro.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/23017557375.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613848da734cb---75253523558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=barbie+dreamhouse+androidPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB86 16328 bytes
SHA-256: a44cce00fd97c75512f4d0115aedcb9f921f156027207d064fb1c082225f172c
font_01_sfnt_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 26104 bytes
SHA-256: 4dca8c5436c2c165a707a979ab1c2df92d70327640e96a8c8a35e5131c5c6067
font_02_sfnt_off00013287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13287 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_03_sfnt_off00013b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00015355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15355 10660 bytes
SHA-256: c08f25b2c4098662544e4e764e20532439f265c0a38a3120fbbd6200a9b2dd21

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