Malicious PDF — malware analysis report

Static analysis result for SHA-256 12dc5c90e40a8c0e…

MALICIOUS

PDF

84.7 KB Created: 2021-09-21 08:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7116b258b8ac7f0a24e41c13b778fc8 SHA-1: fb5110046e4762a9df1981d4da7bf0063effc6cd SHA-256: 12dc5c90e40a8c0ec6bd7e3cd9bf9ba885b585c3cf54ba098e77c84806451fae
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, indicating a lure for the user to download a payload. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://k3projekt.pl/uploads/userfiles/files/54798109558.pdf In PDF document text
    • http://fitviewer.biz/files/file/3288232839.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/pobenuxedidifanipajiburo.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/51538846685.pdfIn PDF document text
    • https://clubselect.ro/ckfinder/userfiles/files/6543176801.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/2e205c66e15fd818099acf58c7a6acfe/nopetuviku.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/puxedakipuzu.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210918221631899.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/94681380795.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/f720ebcdfe71ad343d47d7752629c73b/46465642460.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/gifogixejazu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1614091da7fe84---92810584937.pdfIn PDF document text
    • http://strandedtattoo.com/file/gajitofevumawamupipo.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a7adbd36b---muduma.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145fe7cbaedc---xujopuzerowefi.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/sixunofem.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16132f9af959f1---50164729613.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/xukadowijuluped.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/68823723208.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/nabovuzuzub.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/turinunonutokixox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+apk+downloadPDF 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_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 19328 bytes
SHA-256: 3bf3ac3f71df5ba83c4a25579352078f366c31a1eeff13ec710bdcb5ee117f79
font_02_sfnt_off00012e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E81 10272 bytes
SHA-256: 21a2aa74442c248bdc8315d26d038b1056a0c6fa958a61cd65e66a348cf53768

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