Malicious PDF — malware analysis report

Static analysis result for SHA-256 be15176f7835aa3f…

MALICIOUS

PDF

89.4 KB Created: 2021-06-30 11:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a71ac5ac820ecc030e1cde386175fd77 SHA-1: 68dc30f85607ea49b421d4a14e98aadcdbfc98c5 SHA-256: be15176f7835aa3fbddd6b726b16260a5afb6a527da23700eaec002d57622b7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are likely used for SEO manipulation or to distribute malicious content. No scripts were extracted, but the presence of multiple external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://drafthe.ru/uplcv?utm_term=knowledge+and+awareness PDF link annotation
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/a868703098794a113c9bdf7f826a6128/30489253651.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/18c2523305e57e057fc84805ae528b00/57432682278.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/65067641114.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/21440886801.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/belupukuripumebex.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/betokusaruradux.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a166b6e82---54209392857.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/27d1e3e0a4997a4b1d8fe4a971ea712a/76845557322.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608950d84e255---17960724904.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/numaviferiz.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b156b5cc2da---nufavutibip.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-12/20210612113158816674.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/nbk1lvnlve99pu9s01fo6infc7/sujajune.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cdacfa177f0---sosujedixiguwume.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/heuuqlticpq8fl07ercoubdff7/77642269768.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/90587468874.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752ddd4c598---bidajufulimebuwipifebexi.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/gabufim.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4e2fa4852f009412511cb914d36a6d35/94763397515.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/28859551009.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/wegukiben.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_off0000fc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 10308 bytes
SHA-256: 4a6cd5a7a403c4190d6d197e023de4e9cdd2a6fba11a340e5548aeabda695b3a
font_01_sfnt_off000113ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCC 17512 bytes
SHA-256: 5ada414db9c305940da1271561d61d2fed3d8de2125756ffea3357a6cb766788

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