Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e02a173a570529…

MALICIOUS

PDF

77.4 KB Created: 2021-09-02 01:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9cd8771365bd6a348b91a6f1e77c7e68 SHA-1: 469592ffb1806ff7d9ba0ee23267798bab683cd8 SHA-256: 58e02a173a570529cf165e19d5618da5e8d3f2bd5b344a88e1b0ff95565a0d44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://transturist.ba/ckeditor/ckfinder/files/files/zurirubu.pdf In PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/livumabidaromo.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/78075992261.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/86970134076.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ffbd52fb6d365d0d12385963aa9ca507/35989258253.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/57966242434.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/88258558305.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/99731627573.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/arstvjn7l0m9a344j98tkspor0/dezolo.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/sofozesezamogitubonulo.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/vilirugawobevokuxokirolev.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/45055969947.pdfIn PDF document text
    • http://balone.net/_upload/file///poxunuzapufunijuperuwur.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c820fedebb---60888932853.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/485e6ii03hr3fkfqo09mce1ep6/nawuzubelidexo.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0e7cac140381242b2da49dbb25204990/71776758455.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d59b5300d---moted.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c8b1b01987e98b48a361c3e4c508f4f1/jipadi.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/sotot.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/0gnr39jvvvu0o9qp99ercptca5/kojawamisitonogugoned.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/zaselosogawizuzusetepe.pdfIn PDF document text
    • http://termocity.by/pics/files/92002393806.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/6130042933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=fairy+tail+100+years+quest+21PDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/29c7bd736a95c86d94f7dcb0277020bf/fuwusuvuruveji.pdfIn PDF document text
    • 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_off0000be89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE89 22332 bytes
SHA-256: 528a6da4532b397b7ac426f88ac8737d083327e2582ac3114fed9dcc0ee1a7aa
font_01_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 10508 bytes
SHA-256: 98dfe5a6016b822997f8bce518874a617b9b6ca983dac531d17643fb495e4f06

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