Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99e5b6b0ce49db7…

MALICIOUS

PDF

84.1 KB Created: 2021-08-15 00:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 62a66204788bfa5296f5e1963f8aad63 SHA-1: 7f1dc520bbb9a1fc795b0178263bdc591c1dfd89 SHA-256: c99e5b6b0ce49db7c00aaa72c4527339e034254e52a7c3324c695d010c5bb07a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicate a link farm designed to redirect users to malicious content or phishing pages. No scripts were extracted from this sample, but the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/uplcv?utm_term=how+to+make+a+wampum+belt+with+beads PDF link annotation
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608721b0e6b79---bipofijupevurufipi.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ab1425735ca---jigegosajudebowa.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/moxorelawivosazugufepukak.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/39293256626.pdfIn PDF document text
    • http://edgecs.net/documents/96992835544.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/suzer.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161095c50ab5ca---komepi.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/tefopijasogu.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/52761966417.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/womutawokipafe.pdfIn PDF document text
    • https://pindimana.in/uploads/file/39600100732.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/84768058018.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/51285366551.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/6rc2cpm8bdjpdrphh84atju84o67u6rq/gexelexa.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/m9u34lu5sisum9au873srluq9l/3153967472.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/96958001582.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/16921177962.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/veremovi.pdfIn PDF document text
    • http://rld-carbon.ru/file/53678582953.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/49868770206.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b41cbf99093---75997218916.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac82edf0487---57091143750.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/73hedtb0o0um78ch09ackfuk9f/11821568894.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_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 17128 bytes
SHA-256: 2887f9ae806535902a6080dea97f44128100848b9107e5fabfef6846a2a9a07e
font_01_sfnt_off00011244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11244 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5B 10864 bytes
SHA-256: f3c8d6c89320ba9e3c716943435de90e0e39a6933178eac82319c9f940bafb90

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