Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2649e9d66b456ff…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 17:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19d8e98f7563e7543ade3d4dabcf2055 SHA-1: 18bd0283d8e66a2dc27a1998507453edd820f6a0 SHA-256: d2649e9d66b456ff9ccb5d20d14b3d0d2260532c6a93062caddf10dc444f1880
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm hosted on potentially compromised CMS platforms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via the linked sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://brune-schmuckwerk.de/ckfinder/userfiles/files/97757010574.pdf In PDF document text
    • https://tavcam.com/upload/ckfinder/files/kotejomizaxuwatowa.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b2263ba8d---48240023818.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/fatiwoledotixunefom.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f3cabbb36---gidukexaj.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/16320677716.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/40059477262.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160883cf646810---50852745160.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tdkul74m739irfccdv7b5om1r6/83087174702.pdfIn PDF document text
    • http://webbuilders.com/files/file/11382740463.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/39492235985.pdfIn PDF document text
    • https://wildnaturetravel.com/File/35573732762.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1833d5f1d0---49117362421.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/dc5867f23b39619922b2caeed218f8f4/kifadosisogijun.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/pilagiweniteba.pdfIn PDF document text
    • https://okazionche.com/files/dabevesufofipepoduforu.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78596e2009---milifotaj.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1a1f85ad833e8ae09b0c853c695cb2ff/pogimoranovow.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c70208156e8---lawuxomuwugimawivovoz.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/baweruxuzabawulez.pdfIn PDF document text
    • http://fkhd.cz/data/img/mulalikuxekupudomijej.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6e34c74f6---tirekodadedosek.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9824abbfbc---fovezuxememevozuzo.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105241152365805.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/45tgfhtf6nvel1mtlprnrfa1eh/riwiwawoxodasum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=lvdt+theory+pdfPDF 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_off0000d92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92E 10160 bytes
SHA-256: 9539e4cd6d8dada47edd9a4db08e615ecb0537401a81d79bea550ae67410a1ea
font_01_sfnt_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 17004 bytes
SHA-256: 6f0a4840e318f15ac6935b2d278bda812abd0772ceea162439bf25f0f62e1dde
font_02_sfnt_off00011c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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