Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf467653a9bc2d91…

MALICIOUS

PDF

67.9 KB Created: 2021-09-28 15:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d261b0a45341fb437926c177b5ce78ea SHA-1: 812587adb30118b76112c4e8ead46e458c50cc52 SHA-256: bf467653a9bc2d91efcec17709f1ff60ffeb2e1934c22a8855181f8d8687b4dd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a large number of external links, many pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The document body is heavily obfuscated and appears to be image-based, reinforcing the lure tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://marblo.ph/app/webroot/img/files/kirepipinabulemurixiv.pdf In PDF document text
    • http://epwuae.com/userfiles/file/59038309099.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/mozonujemitanotitetu.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/gukis.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/36335501167.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/4a1c1d3ef7417242d56968b694f739f1/7272577432.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/03a275d6a4e1ea1e6209f1fd72c71e18/23792903081.pdfIn PDF document text
    • https://toocapen.com/files/sekilizuxarov.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/2670744368.pdfIn PDF document text
    • http://immopolignano.lu/images/75664271681.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b58b4445d5---gobokolajuvaviwex.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/sojuxevabumotiguj.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/pexelasimemil.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/tizozuwikafevebogavori.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/vilinusaludubojeramo.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/vugunekosujowi.pdfIn PDF document text
    • http://grandfiltr.com/files/file/nuguwadanuforuzos.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/tudobusixuwazobatif.pdfIn PDF document text
    • http://protok.pro/upload/files/sifufifazodijigelukenekes.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/40541030585.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/162010_jajibufa.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/gamida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+email+a+photo+from+android+phonePDF 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_off0000add6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD6 14424 bytes
SHA-256: e457475751b3f8b2a54adac93dd6eac97fc9f75ae236407dbed0e94ed07f6b04
font_01_sfnt_off0000d1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FD 10672 bytes
SHA-256: bfece378ddb8ea94fd1c0ccbb340f8a082f9bf9df6160775a8139ee5018338cb
font_02_sfnt_off0000ea33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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