Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd55546e2df7194…

MALICIOUS

PDF

81.1 KB Created: 2021-09-23 22:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ecece594b3746f8c92ceda46bfb08482 SHA-1: 69c00a03d2a2243fb696481e33912e3dc77cb289 SHA-256: fdd55546e2df7194ef25aa4659d47061c47d4bac468bb944da085a12427ae418
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pistant.ru/uplcv?utm_term=android+view+translation PDF link annotation
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3415cc389---pexalog.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/49e5a07663cbedcdd846655eee0ba50d/sodovetep.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/zuxufumuturalatenina.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/2123203169.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/202192222859.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/kesedujekitavefixek.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/82488221585.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/92139626983.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/rinoful.pdfIn PDF document text
    • http://cssh.es/img/file/mirotobopukokali.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/mokewarididifukazu.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/novowus.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/g9npg3n3mpj65gss9hdqvqcv9q/xopidemi.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ccad18f72---26220719354.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/rotuwi.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/7v74rkgsm27t13en6ntr2om861/32259894548.pdfIn PDF document text
    • https://parc-hotel.info/file/gimekomalonuw.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/ralomaxavebulevomowaxobu.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109180108245860.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/87322213722.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/dolekefinezemasale.pdfIn PDF document text
    • http://gyliver.ru/files/files/luxosimidox.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/junajemunajozoliboridin.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/jebefezaxumadexebazimepif.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_off0000d596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD596 18804 bytes
SHA-256: 8c37d606c6741eb4688619330d22c01cf63207c63dfd0b4ff38d9d35f84cf793
font_01_sfnt_off0001072a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 10372 bytes
SHA-256: e09205d4fbc14105e6b8847e6aaac8dead4bce7ec6d40d10ce3aaa322941cc72
font_02_sfnt_off00011ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1