Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89ac0d9009b767d…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 06:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 77ce4bc69303e447a893ef3600e14bcd SHA-1: 09035ad0b300ca558357dede6f5c1446d8f9961c SHA-256: c89ac0d9009b767dba836339b85c549d66292b53e105ce5e9ecc710debe1a48a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body was unreadable, but the presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c8cf14a30f37a7b394f11cab580d5f64/13117156546.pdf In PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210904_37533B45B035C3C8.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e15da4384---zikav.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4a0fa1bcca4849091a9e2628152bf89b/kusulo.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/57823476470.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160883ccd08aca---70788424596.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/p98plt3u314rtg9vg755or6uv6/28345494292.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/xigatasoganofosituse.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0cfa52bd29280678e45c1045a8398140/merutesimaguxe.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/simifatowoxaxol.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/pq270fvggmo21e1mn8aljvlmr5/77762774496.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/jidizegedud.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/tojiguloba.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/71126523866.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/22024417398.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/42769820861.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a930e0dd5e9a185acaed6c37e7fdcf18/97000182443.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/zatus.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/gifala.pdfIn PDF document text
    • http://hainfelderteich.at/18938737005.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/271979736.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/70890202992.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137fb636dbd1---6273680061.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85c59a784d---genodakawewaxis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=grammar+practice+worksheets+present+perfect+answersPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210703/16252654324082.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_off0000cd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD45 10916 bytes
SHA-256: 3dd6cc11fdafd5786f202db45082bc83c3310c116c0350bc6d450dd87fb146fe
font_01_sfnt_off0000e67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67E 19052 bytes
SHA-256: d04f7c201a50ed64f69bf114cd488c13ea2b17a19883cc71ff0de04a71cb0ae2
font_02_sfnt_off00011707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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