Malicious PDF — malware analysis report

Static analysis result for SHA-256 983f753b2b52b937…

MALICIOUS

PDF

86.0 KB Created: 2021-08-16 13:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 8c5fe5bfd50b09c679e82d550e252f08 SHA-1: 25599c698e6a74e9716136d4916aa9eb278a40c9 SHA-256: 983f753b2b52b93773c72950a4bb8ca65e585ad68fa9e82525baa5f4afd03273
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://philabc.ru/uplcv?utm_term=tirinha+com+ora%C3%A7%C3%A3o+subordinada+adjetiva+explicativa PDF link annotation
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609839669818c---vokekakulolunokepi.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/11615352740.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e58924ccf---85981487439.pdfIn PDF document text
    • https://sabunwangi.com/contents//files/xifiwulag.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/83108392144.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/wiseretokinuwokureputi.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/rulupetokajusesepejujow.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23413098320.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/fijabibenaperex.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/lelolibuzadederepefi.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/71976395082.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869a8cdf773---79370417175.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/zafodilejowupipava.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/91184818482.pdfIn PDF document text
    • http://allasclub.com/campannas/file/fugolenidetoxa.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/debavakavikejikapa.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866957f36a7---1300190635.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/18667a47fbb7b58f808f60a9458673c6/tufuvej.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076616d7872b---fepiguvubelapivotodigub.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/80705395290.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f59a4eb4---44337377706.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/lh4ukrtos8pb39gee26p6sm8m9/jekadaduvorekefelujutu.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a2c33e9f---fujefuvigido.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/50921822178.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/g9l81mvupe3e06b5sqaiaseahd/silowufarozu.pdfIn PDF document text
    • http://rld-carbon.ru/file/dafipolijibizivokad.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/48265270332.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_off0000e531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE531 11744 bytes
SHA-256: d23f9f3fd56eb7fb6a7c59f7c02cd80ef232ba98a7b1cd9a99e731b6b445d09d
font_01_sfnt_off00010015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10015 18688 bytes
SHA-256: a3b8abe2ba2e9f0101492ae788e61d4bd8e9e54057d7349146809d523cc84216
font_02_sfnt_off00012e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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