Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece12e7f81feb55d…

MALICIOUS

PDF

96.3 KB Created: 2021-06-29 02:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 842797f9cfce66629b4ac3ead6f214d9 SHA-1: e89c6f8ad8e8e113d64a0a2f6e46b4916787fdf1 SHA-256: ece12e7f81feb55d6aad7cccfccd070d124b99b1bd8935400aeaf6ec72b55140
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The PDF structure and embedded content, though heavily obfuscated, are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=powerpoint+unit+b+concepts+review+answers PDF link annotation
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084edbb609fc---97877748753.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/83878930522.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608030e03c8fa---27145775816.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928fdb2869e---rapadefawefosubuxu.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802687815c5---wasagixi.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fe1e50b9754e9f76c2265339fb7f5c3/38360947654.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607269ff130a8---xofejopubipexen.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/18109926708.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad0a64f3d4---vuniso.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bed351f07---silebuzora.pdfIn PDF document text
    • https://irantruck.ir/data/file/70161381476.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/71380928d5ab8cbaa28540ae9efa6c04/vuwowupufujera.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/94e8e54bc60b6c264a6066b57077673b/90285603495.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a149109e9---dipuf.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/kamevogisuj.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a70a16b9974---96731228824.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8957864784---70507971821.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a459419eafc---45212021240.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7af75a014---kudidu.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/14fac9a38619f4cf5df7cc57710d24ff/26312260942.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/38172322105.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607925bc96c5c---48992409312.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/xumokizivuzibu.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_off00011514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2B 10712 bytes
SHA-256: 63bf43ab60b14a65edca2b665d48fb48a98753acfab71cb7334807b517a805af
font_02_sfnt_off000145c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C6 17416 bytes
SHA-256: eb8d7b3e842320deeac696d6d89fb62c949ae436fc05474f4fe7115d4a512d00

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