Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ccab832248c712…

MALICIOUS

PDF

79.2 KB Created: 2021-09-03 15:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 64fb10094f2e79ff672fa6441fc67559 SHA-1: a464dc283b12d3972fb8c5df42680b7552cebf2d SHA-256: 50ccab832248c712fee66451edec8cc51e15aeb0de91c1bb9c9333e432c98d5d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to compromised CMS uploads suggests a tactic to host malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=manualidades+de+navidad+en+ingles+para+ni%C3%B1os PDF link annotation
    • https://damiel.eu/userfiles/file/farewipasedozibutovoz.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/fedezinowidu.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/1721527144.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/44634921910.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160edde97efcfc---35096239858.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/43430598921.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/kuvolugogog.pdfIn PDF document text
    • http://qca.ch/userfiles/file/lukaxudigev.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095954d30a70---78153600385.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/56607209914.pdfIn PDF document text
    • https://pecsikult.hu/files/file/guwakobefuzo.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ioce2rh8epu64ob8mk01io66n7/ledavuvakimobalufilar.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f747576021a---sowesajuvakavoxuduvu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a48310209---xalotividupiduvu.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/37348315187.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/c76123ed14aa949334e65327043a7db0/rubenokabipiwurewu.pdfIn PDF document text
    • http://feminella.ro/upload/fck/63739430408.pdfIn PDF document text
    • https://fivetc.net/uploads/files/jezowafafedebadumi.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/90016a707f694e26f44b4856718b6d36/melulogejuwisevafuka.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/3971968167.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c54f4169a20---binewan.pdfIn PDF document text
    • https://funbugs.ie/files/file/vovizevudenibubenunu.pdfIn PDF document text
    • http://zuche0551.com/upload/file/rogilafumufajikibujolom.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16f245158b---vupidegututoriboje.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_off0000ccf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF2 10832 bytes
SHA-256: ecc139f887d6a1417e9ef7e8021c53c48a1177ab6b43626e0a21c0952f398058
font_01_sfnt_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 18684 bytes
SHA-256: 9d7012bd99ca0db302f9ddeee5f6cd049b929c8161e07f75fdb271e35210c04f
font_02_sfnt_off00011500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1