Malicious PDF — malware analysis report

Static analysis result for SHA-256 65248991140514f0…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 01:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 74af4c07a1c5626fd6dbc82995dfe0d5 SHA-1: b746e14633405f2e09ac4da71bfa9177149b7384 SHA-256: 65248991140514f085c9164262f6f6d691e43eaa2f9915e673a1516b705f7bda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The presence of external URIs and a compromised CMS upload link suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://askaudit.ru/price/xegovitovoxivekikapi.pdf In PDF document text
    • http://hifitness.hu/userfiles/file/rimosefarivix.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/85260352068.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/jetuxij.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133d16e474be---xabizowapapugozuwokaroson.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/918f0badf77bca4443d146e9f6d09716/65759844646.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/85638581106.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f389c76b3---kilavukotejo.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b99d8c60a68---89629399030.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/jf7jrsuo9hfl4p9nf2inrte3v2/39368739480.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/1eb8ec593a5bdb0454da1eafbf678a75/55383134578.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c428430e67f---5291951144.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/35150679560.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/sefibuf.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/cj25bb9p8e6567rglq7k4jad9k/mivuvaw.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/61bd6150f4e878ddad4abc84ccb87dd3/vupatijazetowu.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079112b57be0---38078203323.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/77742716465.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/waponirugis.pdfIn PDF document text
    • https://sealskinz.ru/files/file/jedusofogujejenezux.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/musosoxezesemopiku.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/dapegexirazabulovinapag.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c925119ad8---xofapenaduwode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=toro+ecxtra+sprinkler+timer+manualPDF 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_off0000d88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88F 17772 bytes
SHA-256: 110b46c273d57aa02ebf2cad701ac6ac7271e48950f10d959d1d4ebf47a97c3f
font_01_sfnt_off0001069b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 10792 bytes
SHA-256: 3488ba7beeda0375b298d011ec1ee8b269dcedcb6db794ffca273fe3ca247c6e
font_02_sfnt_off00011f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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