Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a75b42a0399ce31…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 06:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa20a87b54c6c2af98db5fd48302cb99 SHA-1: cc5e5c0a239814cd23f9de52db07ca332e9bf9b3 SHA-256: 3a75b42a0399ce31d1cf2821d4ae30bebfcfb126e0ed57f90743fc5bea260b5a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were extracted, the PDF structure and URL analysis point towards a malicious document used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 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://tucholainfo.pl/userfiles/file/fafuvejikojelarafas.pdf In PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/161107c2fa0be7---tokudugupusuzuxil.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210609_A974EF99AB29A42E.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/0c5o1rennjle3988csig3iisv3/26036410852.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9609d3cab---52611158398.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be1f5949de---pobapovi.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/84553530896.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/sapijanux.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077549bacd1c.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161139d3a814c1---jadomosewez.pdfIn PDF document text
    • http://arlington65.org/clients/880802/File/mutibisajogaver.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/22a501a0780bfb956b7836e9df3d3b30/tusamadevax.pdfIn PDF document text
    • http://erictex.com/ufiles/files/69813752756.pdfIn PDF document text
    • http://lawngo.net/fckfiles/fikupuwuvawaxul.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160948d9044768---36103851482.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097989652aee---xozerifuzosovofuveguxeb.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/latodovelagigub.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/tebivopofa.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/51158782388.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/nofazelefetegefilobemej.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/76827936111.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/36494638113.pdfIn PDF document text
    • http://farmina.ru/uploads/files/peresobej.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/49691111127.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/742e12752126e0d1993115bcec4fa028/35235565475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dbt+worksheets+pdfPDF 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_off0000dbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD5 10508 bytes
SHA-256: 42b5eed70c9ac913654962d82e8ad48fc006df9da1ddae3594585b8844286e21
font_01_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 19600 bytes
SHA-256: 518cf8a6dfa74bc00a8b5cef218acb289198a0e52a78921cb40468762c797f11
font_02_sfnt_off000124fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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