Malicious PDF — malware analysis report

Static analysis result for SHA-256 38420e8de20eb2d7…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 18:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81c599ba55d458e171a631d5f6c077b2 SHA-1: b2155f00bf2871971cff9492399300f20909c486 SHA-256: 38420e8de20eb2d702fe2b70b050c53c3a93d194ca816df78207cd6bf32c1066
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal a link farm structure pointing to multiple domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the overall structure strongly suggest the document is designed to trick users into clicking links that lead to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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 http://csc025.com/userfiles/file/20210903002508_lxnb5m.pdf In PDF document text
    • https://szallas-karpatalja.hu/upload/92296149689.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/80225054984.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/varekivufubedipufiwiledul.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/33652671882.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/38096062575.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/zifowelopexagoxusoz.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210911133254.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/safimedurofudi.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/84867648182.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/xowaxob.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/filibewewisoxokesapuwi.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380999bee53---34020994550.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/88681799936.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/73076620177.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/disaninadivisuvatowa.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/9962570216.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130dbae101d6---baxewipikixi.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/wiguxosowaxagotokabufe.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/84061836600.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/32946776538.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d512f18bbc---sawafejarokaserisuvo.pdfIn PDF document text
    • http://marymo.ru/uploads/files/xudidusitesirajarulabuj.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/70973030742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=free+movies+and+shows+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_off0000d91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91D 19408 bytes
SHA-256: c7308f029c8948442546c55d469afdf4515d797700bd7286b2b059dd1867cc4e
font_01_sfnt_off00010bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E0 10732 bytes
SHA-256: 52b936daafb83a67170332281fd75eb32cb7ce7d4f624dd1404643d5e126aaa1

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