Malicious PDF — malware analysis report

Static analysis result for SHA-256 3853215551de65be…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 23:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 43c084731dd1040272e51e57b622923e SHA-1: 233eacb380859431def7a47e0d6955a15250c9e9 SHA-256: 3853215551de65be04d931aa3545b52c2ef905e4cec9ffb16364748d415b2eb3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and link farm indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 0 text block(s), carries a click-outward action, and is only 70 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://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/75e29ecb3b0d545bfe8887c63f319ead/37408747054.pdf In PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/rerawikadejofaxovonuni.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/94803282711.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/tilexetixab.pdfIn PDF document text
    • http://zenpersonnel.com/UserFiles/file/73992277348.pdfIn PDF document text
    • https://foulardfotografando.it/file/zevuxomalegoxidipuse.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a245ef664---56317319338.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/72398156740.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210918_010837.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/62765976212.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a944bd0453---39043071207.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1d19c2306---rabisawusefixubejojepip.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/0ni5878hh6n595u0lh8qqueng5/waveresigoxumifopasi.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/miwisozixubuxekipag.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/12224432816.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/95301841675.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/91735064221.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/15748580453.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/panexorudavax.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/nofajinupejopumeb.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/sikizufazijanerov.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f975cc96ef---3693572823.pdfIn PDF document text
    • http://bankerz.in/qpic/files/zabexubidepekuruv.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/15249555611.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/nexijavobozibet.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4b8a78052---41996563574.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/822545711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=minecraft+castle+floor+designsPDF 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_off0000b522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD34 14068 bytes
SHA-256: 6a20b1436a30e7dad7cdaf8bdbd48838a93b60d5d87b7c9f98198e158dc9ec74
font_02_sfnt_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 10644 bytes
SHA-256: 5ae93169087d263c7f99b5085cfccef6760df50bb8371c448c18d6a7357ea7f3

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