Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f150e6935511c32…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 17:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 59c8323890af013aae075277d4ac8bff SHA-1: b37a1b5091168b9dd96f0eae84075b5b0c6cbfcc SHA-256: 1f150e6935511c328acb528bb4c55b5b6e7dfea6369cc2c80f6091f7e3f67598
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of a 'download button' lure further supports this, though no specific script was extracted to detail its exact payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b733b81883---pasidudizuzogojerujiniwon.pdf In PDF document text
    • http://preciz.com/uploads/wysiwyg/files/bugotonaxirajolexakesos.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/jopuleziputibafibenatobu.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/eb0fc4520199a7116ea4ad91a4f950f4/mikavaxogaxitoporuxa.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/xawexanufo.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784925f3ba5---lifofaginewebewifavenumu.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/1122ddde61829e947cc34e3324608cec/88206952109.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/widigufapekopuxaxuwi.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/4385436913.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/50684954377.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/lujiveruwakorivatekopod.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/jakobutedixituwum.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/71139990583.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb031aabe5---lexir.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-28/20210628033239245108.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/zasafepulijuzefovuve.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/geluworunosatuxolowamuz.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/paron.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/82008422525.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/nawafosozovoritajikekamo.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087714ea599b---kapomimo.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9dd1bfab9e6fbaefe824e5b8d0869d77/bogorosubajala.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/dalefegudikenikos.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/175c45c08524404cdaa0ced6a055bf1a/35235931221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=strix+x99+gaming+motherboard+manualPDF link annotation
    • 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_off0000c4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B0 11112 bytes
SHA-256: be6211c938086746d08d6ca1d63ebf4ae1bbdd255ccee9471a015e1580debbfb
font_01_sfnt_off0000de33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 17220 bytes
SHA-256: 82734c75b432a06c6ad257eacc6add19aff294a155477c7ea19a7cec09528f77
font_02_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1