Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb6a066f1e974dc…

MALICIOUS

PDF

89.1 KB Created: 2021-09-13 09:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 573adcd238e582fea10e3968527dac3c SHA-1: efb03f66cb9cdb8ca708fe25d01a47e3a57b465a SHA-256: afb6a066f1e974dc041d6685cc9ff0bbe279ce37f95d8521334f45cee2cee0ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and compromised CMS upload links points towards an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://drafthe.ru/uplcv?utm_term=monster+hunter+stories+apk+free PDF link annotation
    • https://mmtours.si/uploads/ripememitab.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/mozuxunadewidivu.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/fobedapiwuvipesojenawor.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136eb7df0f2e---73848116397.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/xuwed.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161378d22c362d---jigomasidonegag.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/beditejinonorafemejo.pdfIn PDF document text
    • http://envigest.cz/upload/file/22373635547.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/nhvulcnba9mu30e0pqoh203ahf/pamotovuxixalafaxepi.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/pomisifedizuratagavoduger.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/93483567954.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395189800b0---70864056166.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/nadoxokisojikajaxasojurug.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/99832575683.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1e510df6cc68a63ae63b141131af875a/mibujinaveweruxuse.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/77463869683.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f318a01d54---vebixitadibi.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/73690415172.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/joboz.pdfIn PDF document text
    • http://proxima-online.it/public/file/90255326342.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8E 16540 bytes
SHA-256: 221d8f21728957d077f1428f7e97954ab2ea78e63034d36901de849506548034
font_01_sfnt_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 10596 bytes
SHA-256: 0a327dfffcdf49e7d88638220784b495d66d988cbb7d6276c55c21c3d99de5d0
font_03_sfnt_off00011605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11605 25424 bytes
SHA-256: adc021af7f03735f278ec5b04b16f7179f5dd53e7c38780f7b5439e80c0fb75f

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