Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f18d8f05caaaa5…

MALICIOUS

PDF

68.5 KB Created: 2021-09-29 04:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 007b150f1610f701ffeb20966f4de3f2 SHA-1: 3818f4d2f631eea287b77c543c059fcca57cf133 SHA-256: a5f18d8f05caaaa56845f060b309547c4f6c0b8c74906aec3ee7eacd82ea948d
176 Risk Score

Malware Insights

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

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious sites. The 'PDF_IMAGE_LURE' heuristic indicates the document likely presents a screenshot to obscure clickable elements, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://philabc.ru/uplcv?utm_term=pojav+launcher+apk+download+new+version PDF link annotation
    • http://stroyindustry.com/userfiles/file/dofadevadomumaxi.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/vidabezavuxo.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/66134881996.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/69053279912.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/pokok.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b22dce5d13ef50fe65212105aa882547/zeruleru.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/72163482278.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/23866258244.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/87340566198.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/fetutisanozoru.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/loxufodefanoboke.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/11722092508.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/80959147810.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/75180280871.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/374406757e8ff29e9fd7b6f47c0c6575/10513922066.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/81095334627.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109171650479695.pdfIn PDF document text
    • http://skisun.it/userfiles/files/rotaxonepamunusove.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16130d50e6e92e---kitegufuto.pdfIn PDF document text
    • https://thietbigas.net/media/files/91964487654.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/39252606261495ef29a3d3.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/gikiwefotejujeranawa.pdfIn PDF document text
    • https://angkalaris.com/contents/files/37059003987.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/90812980509.pdfIn PDF document text
    • 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_off0000ade8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE8 10988 bytes
SHA-256: 0df2f4141f867580d188364b4709d157852df09655610db4e4b06b93b9d0170a
font_01_sfnt_off0000c763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 14064 bytes
SHA-256: 20715992185e69e67c0ba894762c41c31ecd0def1ca923510da110a1117beb0c

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