Malicious PDF — malware analysis report

Static analysis result for SHA-256 99806adfb82f8236…

MALICIOUS

PDF

80.4 KB Created: 2021-08-27 05:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7dbcf5bae0d5747e571c1b4a4e9569bb SHA-1: 21f42633c42f44a92bb574224a1382651f16b24d SHA-256: 99806adfb82f8236a981636dc0425741229aa56a28030970d02bc5a37f91fc49
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external URIs and links pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://inwebjor.ru/uplcv?utm_term=comparative+of+crowded PDF link annotation
    • https://ibrahimkoc.com/images/Media/files/63737730211.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888e0edc739---84039179157.pdfIn PDF document text
    • http://lecostationery.com/files/file/1880287741.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/9386595739.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c01171cdc---juzivuvovexewewaw.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e51c0607c---gajogafulipov.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/37779977840.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/66411838930.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcda0ace3b---jagugugodirewexad.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/77173783546.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/67438247228.pdfIn PDF document text
    • https://best-label.com/upload/files/70314310998.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/c8e69c00a3b631842573b7aec86e4751/71094018042.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/koxetewi.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/33743512096.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2144443e07---31548908631.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ab8d146d---suwideporesagurafideto.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/owozasogiwojup.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae5904c837---40137463957.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160dfb9b002fb3---vawig.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/92344179226.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/93794978801.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/42210097118.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_off0000d673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 10648 bytes
SHA-256: 8590f20e8576868b83835c4f069500fe0be00877a2a73bc0d931e44ed4cb70d7
font_02_sfnt_off00010707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 18108 bytes
SHA-256: a2d4d2a4dc24be978ae2c5d64c7277be45ba3b9e1000fdab059e7d1fd6fd8d84

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