Malicious PDF — malware analysis report

Static analysis result for SHA-256 455ef6e414b18cf1…

MALICIOUS

PDF

101.9 KB Created: 2021-07-13 23:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 40a054ca5d519eebc003a8dd47ccf3aa SHA-1: 561e93799c4770e982ed766e78e9baf6382b4f37 SHA-256: 455ef6e414b18cf1d0df08eaba541102b993d338cdb3c6588e13bb3472b5eb64
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a06b4238b---lasarevol.pdf In PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/3dabba2e369269fc4788cf0e2cad1e5f/mulemokumarumedivedol.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/dibamemobikejewafike.pdfIn PDF document text
    • http://goref.ru/files/file/440619561.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086681778883---wunix.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/mht826hi8073he0o3rmn5mtr9t/vumasukejopinetakitimo.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebd2057521---gitogaxabojuvebadujorob.pdfIn PDF document text
    • https://memoservicesrl.it/file/9270673383.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/627e1822abfcba091a9c649c5a8cbfce/19173366623.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/f2377acabe72d8254781ed931c1c48f2/34597652563.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/bo6bkfucuke23qkr7hjshk0o2g/zetiture.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607764b1dc7a8---duwevigerutafafetoluvuz.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/vifesenapuwi.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/26835238294.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050321363372.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e0cc30f0d8beb1d68980684184c5a82c/24019470829.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/91503353583.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/2m51g6cb4f9n8j8o14n2mibl54/83542338844.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/3ebdadae4ff847f4cf719d96a50fa8b3/76909670098.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/f0b31933b5d9a5d256dc2b063497e2b7/wovewevutumomotivigukel.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/6d60361247df5a4fb499c1d55fbf1af6/67484524083.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ej0knpp8comnemjr65qr9pgko2/42064054335.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/11830289204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+professor+and+his+beloved+equationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C59 17632 bytes
SHA-256: 1571608994f3419f1fa3598984466d4e34d1b51667a4911ef35da29cf85ac20d
font_01_sfnt_off000149ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149ED 3132 bytes
SHA-256: 44a7c4118465804f62ccab4eaacfdc120a8a1950b8e6797d78f41af32deb3e42
font_02_sfnt_off000156d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D2 11012 bytes
SHA-256: 0e9227b850754867b4949fe1038b4c6a5da0772cc90c8fb88294be002245bba4
font_03_sfnt_off00016ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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