Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8595716cfe6024b…

MALICIOUS

PDF

98.3 KB Created: 2021-07-21 02:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ab4c54bc2a56fcd635eba315f038fe61 SHA-1: 77440a5044b0c2eb7de674df12830950ee156567 SHA-256: f8595716cfe6024bd7db6f56e4873fde9dd45b4a3bafe7a650db698a9464c010
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to websites hosted on compromised CMS platforms, likely to lure users to malicious content. The presence of multiple links on potentially disposable hosting further supports a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8c33cc7a8---jiwutivibale.pdf In PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606da61ddc3f7---74893935568.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/47131189778.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/96594120279.pdfIn PDF document text
    • https://estoniapools.com/contents//files/79002027808.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762958295fb---nonejujalagezu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd50154e27---futoru.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3b0019b6aab8921eb863b53ea1d31d69/95576594572.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/c7114f80bd1bb75c5882db509b789ce8/56961846706.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3b71af07f---poxuturu.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/c7e735582e9242beaed0bdc3402e737f/85867066354.pdfIn PDF document text
    • http://bdn10.cz/files/file/tomofamano.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/h7ogsk45n328msd7tvssetgarq/77437306225.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/85521309857.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5daee4b334206165f81a690dafa624c9/fakigora.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/53571839529.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/4fc5775f66d87b7d71bc6b9bb80748a9/kabolani.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/p2vde45tr186egi3nob6ohdt72/jewoxowosajatugix.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca323ccb91d---74777876649.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f39fc59fac146fe45a7832c2f9d42b6a/tipoxekedojilubabibod.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/dixasotamulofopa.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/samimeribaperutogigur.pdfIn PDF document text
    • http://alkanboya.com/files/file///didexugejewetikige.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/55278310144.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0e2a2eb4ee93a0be6cbd85bf60ee57c0/fajuduxavebajubos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=right+side+tooth+painPDF 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_off00012018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12018 10572 bytes
SHA-256: c6c9588877c24e1c3e8cac49981642220bb7412aa6b94e9c11e0cd779e1d163e
font_01_sfnt_off000137f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15009 16884 bytes
SHA-256: 5551e49738d8a2686d23f2ba857718c1e55295870a15e083b6a0641aff5a611e