Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e84c4fad434d55…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 22:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 526e47928c56b00acae531f1f3d8c7fd SHA-1: b835dad3237f44b92342170aff5bebdec953ca6d SHA-256: a9e84c4fad434d5530ddee43adf67de50e7aaed48bb7b3f6ef0ae85a0c3d2f05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the presence of numerous external links and the nature of the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://mpti.ru/userfiles/file/litopanuwused.pdf In PDF document text
    • http://a899.net/userfiles/file/nomideru.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/0e5c8ecc9794bea0817ea9b98a4c8f6a/wezewezedazare.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/23618815229.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/bcdbb5177b937c9a557eef5476fe9417/6426187833.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/55161381989.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/93721173049.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/zadamavomigebavexutejupi.pdfIn PDF document text
    • http://soc-in.com/data/media/files/bunenefudajubifinixote.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146bea58b23b---desokisuwitegoro.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/komimegomuwixegedijuzowo.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/wobipumuj.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/kudokonawula.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/27888166669.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/kamanut.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/tuvowi.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/13093727166.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/sojozobokotidexikikudiz.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/pitujatiwaluzezekovofiki.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/98438751990.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/27528474788.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/sexipok.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/98165d12a16da68cab3a211659edc7cc/babozifapej.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/fisolagupagidojet.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/41a1981dcad17b036f1e6f896d9f0186/12969752210.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7e33b2005---26633517901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=dual+space+app+free+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AC 15476 bytes
SHA-256: d07b883f5198e2c4a0ad51f2c0cd32a8a80e5aa5a69617674f289b96094ae82e
font_01_sfnt_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 10612 bytes
SHA-256: 92fa197727b59b4edf3bdbe93f46676e8c1c5f41e06fa37f18e21b8bbb8983cc
font_02_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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