Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a1785f15aaf8a5…

MALICIOUS

PDF

84.3 KB Created: 2021-07-01 14:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 007da89af2fa25a6573681b0d6e88dcc SHA-1: 79776c679e9868fa3e3154c6bdf97f840cb04e0a SHA-256: c2a1785f15aaf8a53a6a78d9d895ecb26a73157da9ef11e817b765ea139affec
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=hymn+and+he+will+raise+you+up PDF link annotation
    • https://lensprovn.com/ckfinder/userfiles/files/nunefodoju.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/68a5a13c4ea3273165c0bd3aece62834/24283408553.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b205a4a688a---garugitata.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087219e5af92---37124581615.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/ratonig.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1a5b736c27289d8aecb8d4c5d2587d2d/54135780006.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/99280256781.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/76731090541.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/46397266288.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/wenekometerutulefizaru.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dazexenunute.pdfIn PDF document text
    • http://goldenrulelodge24.com/clients/860883/File/kawetu.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210614010909_wyc6ei.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/arbjv385pkageqn1h30iie8p32/11921682375.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///dazemenujigoroputiboripez.pdfIn PDF document text
    • http://simonide.org/userfiles/file/wuzubozizadabi.pdfIn PDF document text
    • http://funperm.ru/content/file/19062927899.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/32p99n3fi85qkge50lrb7jr5df/34072423328.pdfIn PDF document text
    • http://texmet.pl/userimages/file/nibureferutovufarugunutal.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d3a1a6057---50015097874.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/zibafuk.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc2a2324d0---litinakakixalojifox.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_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE73 17168 bytes
SHA-256: 76d65fdd32c6ed1b1a4f82e3d5fef5fe285f62d13d4dea8799d24a559e363906
font_02_sfnt_off00012b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9E 10852 bytes
SHA-256: bab3cdf2231aeb6cfd86dfcce95a4034d91009681843652818c515a8d7048a2d

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