Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce471ca685d6823…

MALICIOUS

PDF

84.5 KB Created: 2021-09-08 07:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 628572b46f7f52e9395daa4ad6d022e5 SHA-1: d6f22f69016d3f106fb6db41dc528d1c9c995fdb SHA-256: 6ce471ca685d6823fbb74aea0d766a40bf173c0d800bd9bf2a07ca322b2e0c59
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and the presence of external links indicate an attempt to lead the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://jakspravnenapsa.cz/userfiles/file/2485828600.pdf In PDF document text
    • http://zhongguohuachun.com/d/files/muxefevedixajerasolojuxu.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/bekudadilulimafudivogofex.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/597sm1j11chop0is6akjcu7qbp/waxavijimozanivenu.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b471b78dabf---10684036843.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/rejudodagodudanipijiduj.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/14545331158.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/13128234767.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/99599107872.pdfIn PDF document text
    • http://mousike.it/img_ins/files/77663798038.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d863ddbff1---xopekan.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/6454471ed2533a4696571cd6d1a2863a/batokuwo.pdfIn PDF document text
    • http://schokobrunnen.com/idata/75319707834.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/28907072913.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160982e6d67e39---pejalojogoraweruni.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/3e8b361ca6a53789d212c86e51a31a5d/4516740201.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/90298447985.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/31627595007.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/3pqvkoqd06cle8kpq83uk2see6/niberadepe.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128df3b02a2e---lowapazovorobudo.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/10408444759.pdfIn PDF document text
    • http://zzweien.com/d/files/kavagaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=atomistique+exercices+corrig%C3%A9s+l1+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_off0000deed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 19276 bytes
SHA-256: b499b2040b29c6248fdf0145f16ee613946f41c5d4f24e8377d6f6b976716265
font_02_sfnt_off00012882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12882 11232 bytes
SHA-256: 53d415188f765add5dd705887c06cfbbb8721ba779162c7da57f6c67e21e69ce

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