Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a9187d805e4909…

MALICIOUS

PDF

75.8 KB Created: 2021-09-17 15:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de33b7590cb3ccb300238b5f6e2d2d84 SHA-1: de4065a7eecc74807202daa471260970c3700ad4 SHA-256: 75a9187d805e4909572d8a14698ba8f5bbbd7abc8a439e7a8a51c5e4be8caaef
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high number of external links, many pointing to compromised websites or disposable domains, indicating a likely phishing or redirection campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to distributing further malware or leading users to malicious sites. No scripts were extracted, but the link farm pattern is a common technique for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ecohort.com/userfiles/files/33062136199.pdf In PDF document text
    • https://susta.vn/userfiles/file/vasenazizufodosotefuru.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ede056eb3---vekatifalenuvoxemakojav.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/27482882628.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/38643773841.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021912171125018.pdfIn PDF document text
    • http://greenglobepms.com/uploads/nipewulusifolivi.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/15506945557.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/tiguxonedemuwi.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/31320835481.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/en6brvtt20eatfk0c57nvva6rp/gojawetuwunetenibi.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7d8570c8a---pewugaduna.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/votaxurinubebo.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/b2mtaip7rfnk9pcfsubq68kfht/riruwunamuwewu.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/20665297285.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161342706a1229---67726989293.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/1285786839.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/7234672787.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/nakusonus.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/69292566796.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/58436671869.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/dimazoweg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mi+box+internet+connection+problemPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E0 10440 bytes
SHA-256: 1ad3a2d3175e2a0773e622eea40c11c868177b9a63884cce362115449b5832be
font_01_sfnt_off0000cc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC47 16416 bytes
SHA-256: 0a7c40006fc27d51153b21d6a48ea79a8c7f146cc8b15030b343ea684e52a4c8
font_02_sfnt_off0000e2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 15100 bytes
SHA-256: 58c99f48b753f92937d1a57f029ca832c043b64d61ece331f670da5394d90136
font_03_sfnt_off00010914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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