Malicious PDF — malware analysis report

Static analysis result for SHA-256 0860615eca9972d7…

MALICIOUS

PDF

100.4 KB Created: 2021-06-28 11:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: beb11074950c7450a2ad61b0a3a16388 SHA-1: d2dfdb34e765770af9cc9e98af946d4d76dac32b SHA-256: 0860615eca9972d74b32c5e1c9bcc2fd5e0363bb5f8e162c8fbe756274236d8d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories. These links form a link farm designed to redirect users to potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4e7d6a37b---kejajexudexi.pdf In PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/lakunosirerevekodaneberi.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/82b8bf52193f5a196c9254b6b4ab598c/wesojugevof.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/beloleputobawafiwubavike.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c235b75f0a---mizusejerelidajiwategudu.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/zizeboluloja.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/db3619407d61c11fb17260403a0681e1/sinul.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/kin28n4hqfg608ag9sne5ro32n/81550557567.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae889c9c10---19063031439.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/sedosaforu.pdfIn PDF document text
    • https://advik.net/userfiles/file/93971995756.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/gsv149nou1spbua97j9o2q16ka/39581261113.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/riwijakelodamekexarut.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0eb83f546---mepedus.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/55101009298.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vv966d2vn952khvl92b74qs5l7/taxelazizarojabub.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/a8c7cfd7a0fb8d53ed4e8cd5106074fd/vogorogodoxixebaw.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/c6aef1d6b3174450398f2010a5b68161/pufasibireluponat.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/jazisuke.pdfIn PDF document text
    • https://seerupit.dk/assens/file/38683748105.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/71087038148.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760cd578e11---84723978544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=square+root+of+136+simplifiedPDF 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_off000122b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B9 17708 bytes
SHA-256: 66066945f4ea2106606056b6633a02eb0c6984893a599caab55ee5d9d146f397
font_01_sfnt_off000150bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000168d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168D4 11268 bytes
SHA-256: 1b67d72b2649499cad08b2966b67743fe78dd2c60658d18bb85c8442b349afd6

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