Malicious PDF — malware analysis report

Static analysis result for SHA-256 a487d1a5cf257add…

MALICIOUS

PDF

77.6 KB Created: 2021-09-07 05:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b70def56f59576b09af4d7b5e8076ade SHA-1: d9d8b94bc5795b1227e99e018ea8f1174ad259c2 SHA-256: a487d1a5cf257add353b50f5d0aad649bb558c5ef283090ddd0a204acffcefd4
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV. 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 clean score 0.2081

Heuristics 5

  • 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
  • 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://nomylo.ru/uplcv?utm_term=asterisk+manual+pdf PDF link annotation
    • http://contrast.no/ckfinder/userfiles/files/61741632578.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91c0db5b7d---78377695778.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/gn1s6n68uhchkrulh5nb55c464/zewibupimevatafotozanet.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5391e3136891f6f6912e6ac684c1644a/bivejunudipoladejiserori.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bdad5d58a---67237085845.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/wonuruwuw.pdfIn PDF document text
    • http://ccadl.com/files/20210709131032.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/58197371403.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a321b28ebb0---tefafosezadefugotewufopuw.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/ca5a246d70e72ddf27089efb1ff85fe6/55248743069.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/70513521771.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/09f0c1b423ec3610cd2f41a21a20f697/tumimalid.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/lodinejumiporesamovoned.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1612548244f86e---36207777961.pdfIn PDF document text
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/20518287396.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/sofasovud.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/0llmc34d96gm8m7qjrgc2jud1c/kinuteko.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b49fe788dbca6446a92c5deba3759421/gifenogimuj.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/takupuwoxajabufevikuju.pdfIn PDF document text
    • http://ihdbd.org/upload/files/kenesewomab.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/19566588386103fe73d27ec.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/befenareluxepuvigureku.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/fajaxigujutazanurigebave.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/zisiv.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607982eecd39a---93839847200.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/46pm1hega4pr11rcb6k7kdfhn6/28690439626.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a86e8b3e87220093c4c7a3c11d39e4ad/51523752038.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE043 10712 bytes
SHA-256: 7afc0b567e89e674da58a7bb1a0263d7a4ec685552e8613453bc44861d4f1033
font_01_sfnt_off0000f8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 18068 bytes
SHA-256: b6c20aa09ef9f693ce60099e8fba2d23eb1509275cb06333a156bb4c1493b421