Malicious PDF — malware analysis report

Static analysis result for SHA-256 894e08dac78ebc90…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 07:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a5ce41c22d800dffb7fa58bf0ea8ec0e SHA-1: a0650979f79b778a70a34138fd442af4903268f7 SHA-256: 894e08dac78ebc9070efc8d6b52dc44d34c3248bd669072b93a4cb5323a29b0a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.q-jin.ne.jp/ckfinder/userfiles/files/mumutobanotasiki.pdf In PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/91589885808.pdfIn PDF document text
    • https://cmoretv.com/userfiles/mirivabaxa.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/vomobegagenedojugetafa.pdfIn PDF document text
    • https://nasikampung.info/contents//files/55411689738.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/panejowudusijokaret.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/7evgumdala8vgeu1tdtl9tddk5/79717779424.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/96082735753.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/o3bsfo63fg62ro0iahc67f5jr1/nebofozubukuz.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/ea86e5898adcab4b6050a9768febb196/41675040238.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/40462207046.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ba59e2818---25198829425.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/3ptl19igr01h1keesb639rkpm5/riropupezorumije.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/18976247575.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/turewakogonewebaresimes.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7cb523573e---tizaxulig.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/nexevunonewosonuwowijip.pdfIn PDF document text
    • https://fasleh.net/Files/files/jujexomovakefisepakos.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/32ko17nbsnis845i3d8etbadn3/57061417576.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/jasimemawuguvatelulufido.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/siserazijomajanabom.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/1992587716.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/27372060547.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d328d58fa---77822114603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=standard+dimensions+for+wardrobePDF 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_off0000e069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE069 10772 bytes
SHA-256: 887db8f6b10759982cf3702298988e7a2780dcb77e5b082c77dea77db1d121c9
font_01_sfnt_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 17676 bytes
SHA-256: 1a84cfadd54fa216de6eb1b8a1ee1c9480e7d5213ef9f0ddc8c50186f6788215
font_02_sfnt_off000126b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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