Malicious PDF — malware analysis report

Static analysis result for SHA-256 db15efb650927723…

MALICIOUS

PDF

82.9 KB Created: 2021-09-11 00:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c89bd6ae8b0a9c70c47c416a81e5f4c7 SHA-1: c3c3fc459f17ef9bac2fa5608b61a2ee96032b18 SHA-256: db15efb65092772350de39f9139363c7218010a8a106f6c28b18728a92d52991
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic findings clearly point to a URL-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/bd42bed4a470dd3fe6af4512d148e222/soref.pdf In PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa02016b7e---vusenova.pdfIn PDF document text
    • http://kme-kme.cz/files/file/14592186578.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/wokerikefigeledujavet.pdfIn PDF document text
    • http://519pf.com/userfiles/files/83027995725.pdfIn PDF document text
    • http://air-ned.com/uploads/files/sarasifuvazekejajexafi.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/jolorivumadodimagafogi.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/5956017776132ece642df4.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4db08e15d3c808e6abe6796275f6afd2/74023915249.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/53600079299.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/38390906649.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/34276986574.pdfIn PDF document text
    • http://wirheiraten.de/images/file/jibiganep.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161338f377d55c---1811898087.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/52507505238.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f174b4d959---jibezipezufuwotetuloni.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/10629925485.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/60850540942.pdfIn PDF document text
    • http://popmetre.com/news/files/lumakajobeguvekurub.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e522861e3---gezodanavasez.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2335c0a759da9bcdfa45ce55caa41ea9/jatatabarujelewerirob.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/80644068862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ui+components+react+nativePDF 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_off0000df75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 10560 bytes
SHA-256: a010b8cfaf8ae6fe88d35b817d753732b87c2ff7a9392221cc1ba0a5453678ef
font_01_sfnt_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 17824 bytes
SHA-256: 44b2a7bd8f677b4c5c53828bc112f94525cf9557e86695ff24a88ab40baaf11e
font_02_sfnt_off0001267b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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