Malicious PDF — malware analysis report

Static analysis result for SHA-256 8312a355ae49d160…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 21:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: faaf3dd551226e5cd0fea14fbddf6935 SHA-1: ee8f49eef86193b7b32aa34a105fa94b3e24ad42 SHA-256: 8312a355ae49d16077a67e3cef749ac3f0ff66760a4aeb426dfe9ec6fadcaf63
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised WordPress upload storage and other disposable hosting sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://allytemp.ru/uplcv?utm_term=vms+on+android PDF link annotation
    • http://cpbnatation.fr/fckeditor/userfiles/file/nixivugogube.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/65058054885.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161439e3601560---vesotalarilovogozaf.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/27262045738.pdfIn PDF document text
    • http://tdbm.vn/upload/files/67380636856.pdfIn PDF document text
    • http://rurisnet.org/images/file/xiwezovebujiv.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210905_212013.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/80738289054.pdfIn PDF document text
    • http://findusafranchise.com/files/files/nokopegidotofurepoto.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6dca61fd1---lavofoxazejaxim.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/dibodaduderaxe.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a8624cf229e8931e62b029925d109922/nutaj.pdfIn PDF document text
    • https://phukienbep.net/media/files/pusuboxojazelesemijitaz.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/pojujirofumopitidu.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210919010610425.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161449f75699f8---91165660843.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/3817319764.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/gokefedukajetubetatofewe.pdfIn PDF document text
    • http://airmon.hu/images/files/jopupoxiluweb.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/fisuz.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/24318263572.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161358b9f70111---56564276807.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/63639352356.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_off0000eb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 10100 bytes
SHA-256: 658035a3b6563f2469b1ac46dcffa2f5c2d2d76bb90a4a5afd96857781a7182b
font_01_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 17296 bytes
SHA-256: 1789cf8794016b0d227a106d6d0f9616cec91a067477f257d90703e4a24f432f
font_02_sfnt_off00012e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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