Malicious PDF — malware analysis report

Static analysis result for SHA-256 27cb504bfbb2a2fb…

MALICIOUS

PDF

95.7 KB Created: 2021-08-01 23:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cb52a6cbb64ee177a1dec1f67292b73c SHA-1: 9def2208189db3d9d9aaaa78d1ea7076cef721d0 SHA-256: 27cb504bfbb2a2fbedd38c0579c1661cd387068f94ecbfba94f12a9dc3fe2a7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple links on disposable hosting and the use of UTM parameters suggest a coordinated effort for SEO manipulation and user redirection.

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://ketchas.ru/uplcv?utm_term=download+save+game+gta+sa+android+100+tamat PDF link annotation
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c74d067a3---zufabotosumipur.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b5a5df84c17294747238f5ceac5fd829/17172977390.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/72050681630.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/wodowax.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/zevirobiginewiwufijomaka.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/77fbbc1dff138a871bd2c588c3d4d768/39336830831.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/zugugis.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/44290055453.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/21244922384.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160984556ca565---zisukifupudovosemavapa.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/xixalekerebonozoxotene.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9a921ffee---zawonodekudupudimo.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/supinusolujegojitunanal.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/41805861331.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077355c8bcd9---37549339171.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab3c018e03---dexowiwiberemafovikanus.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/812f56bad10b67d9fc4db0707381150a/kibesawowegigobunenas.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1d3424db8---8216346980.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/fusiviguvi.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/jfmpqqclgs7csektkrufmolfqo/87246849884.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd3aa06b94---77743647362.pdfIn PDF document text
    • http://co-mit.com/uploads/files/lubobi.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/lidis.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/raxupux.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 17836 bytes
SHA-256: da4a8290b32c59d33ffa50229c09c50ca3d02994cc1f2c241acfb9c67a68cc9d
font_01_sfnt_off000128f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F9 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off00013e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E70 10916 bytes
SHA-256: cfa8fec803f15949cd94f3c19bf1dfd6b386325904ba266d6bcb266708a4b9a8
font_03_sfnt_off00015792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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