Malicious PDF — malware analysis report

Static analysis result for SHA-256 71406373161e030d…

MALICIOUS

PDF

163.8 KB Created: 2021-07-02 06:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 1cdd9c01810411a59f129686ed1836e9 SHA-1: 60b32453a34f701d800fa8a97a5f5ac68fd3e280 SHA-256: 71406373161e030d24e7ff95fdc2ccde51562f041e646db36e35f496c263ec97
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 suspicious score 0.3099

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://ketchas.ru/uplcv?utm_term=4+chambers+of+the+heart+names PDF link annotation
    • http://xahscw.com/userfiles/file/73880549.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/trj84vc41jmik5057dv989khj2/89394430285.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160796dc55da94---34827136666.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3c16501474394d7583ef31c3ceb50b64/guxetifijisiguw.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160db4b39d334d---3545848395.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49121ddd12---64205394984.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/4e5e0f91d152dad2b7e2cc2f9594b02c/pipipamolonarawebo.pdfIn PDF document text
    • http://immopolignano.lu/images/44138484445.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c994b322e3c---lizopodavadomubinuva.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/fba02c99087513083c213d132f972102/vutezaragupefu.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/bac34bed9f6ba6b7013a17aa59423490/pixinatesikoza.pdfIn PDF document text
    • https://steammining.com/userfiles/file/wokodelebaz.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5e8926116---11668186314.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d22f28a4b7---vogoborefezosivopuxexamut.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/15942552276.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16071a9efbbe5e---tojemuvopajadorefezanemur.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160caf51d2d4a5---54510203979.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/90a50cc4c6bc0bed294c7f28af7b5e1d/37444673319.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb7d838481---94542391495.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af81c41f04---pusemubizit.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c5f166a8a---70921023643.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/12550954413.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b2d9335a1fb4b197c18a0f52423cc2c8/rimivo.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16079df662504b---2122614996.pdfIn 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_off00022bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22BD7 10584 bytes
SHA-256: f577047d4c1cd9462d6e03f7f7460ab7dcc7dc5acc41aaff70a58b161b791a1b
font_01_sfnt_off000243de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x243DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00025beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25BEB 1984 bytes
SHA-256: 5af3ff85911778c7872a4cee438563be155fcf70f14e79991fce4a2eb5eab62c

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