Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f11995c49b43b2…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 04:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: daec7a036cf3bad839c2fb4de3e31435 SHA-1: 99296fd4e1d3a48ce9c8231df5696a550d230a0a SHA-256: c8f11995c49b43b20c02fca03697293fe62a64a39ccddba137005c129fc68cd7
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://arbormaster.us/uploads/files/mivukanukagive.pdf In PDF document text
    • http://uzks.hr/upload/datoteke/gexelotopufebozazej.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/geweposelo.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210907_D461879A62420D4D.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/24703384592.pdfIn PDF document text
    • https://5uempat.com/contents/files/fekokajif.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pajukiwov.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/kabogetakegizefuk.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/39758566396.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133f02c07ea6---sanimudivazuvodidozidi.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/60471072631.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/49764600266.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/13051751742.pdfIn PDF document text
    • http://winso.tw/userfiles/file/kelogepazuwekikonuzow.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161467d1e1e959---82391636147.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/12376466844.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143947464adb---4235616689.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/muxikasirot.pdfIn macro / runtime command snippet
    • http://kosmonautika.ee/ckfinder/userfiles/files/sijaru.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/zefomivutosorune.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/47110390940.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/80946553525.pdfIn PDF document text
    • https://www.dekleinewerIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=criminal+case+city+of+romance+mod+apkPDF 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_off0000d30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30C 11016 bytes
SHA-256: 9f0eab3da1916309bf070cdfd5e2291afe15e6eb787f9110f981bbc6568d032a
font_01_sfnt_off0000ecb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 18628 bytes
SHA-256: c84468f8f0a401102eac875eabcb210ce56bdcf83efc2882c92761e10ca66457
font_02_sfnt_off00011d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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