Malicious PDF — malware analysis report

Static analysis result for SHA-256 de934191c2f92601…

MALICIOUS

PDF

73.1 KB Created: 2021-07-24 21:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 549116ce11eb2f5f25f3f4423d661e0c SHA-1: ddbd8566d7751e794f5f6eee994014c23e177d2f SHA-256: de934191c2f926018662a06fbdbcebc9b8a961a93135e4411833422e2cc1aba3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised or disposable domains, likely to lure users to malicious content. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://aryajob.com/user_upload/file/26770318238.pdf In PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/ea7ee9792c4e33c1eba23be11f63be08/65788123994.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/powotomebituxigew.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/35670951998.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/sivozapujiduvabalelisipa.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/65fe2e2fd63938653010fe3762cf865f/fogetabefakumeboza.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b12786f9c---nemikoferiwidelipevutu.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/45535640447.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071110da9b3e---39812375273.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160945f8281cbd---kufogonilerafosipupadug.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/41528236694.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b440195bef9---67133066750.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/878cd085f6a36ff2ce6cb43cd5ed807b/dubetanepu.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/38052453863.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608df36c64e01---lepomepelusezokawawixat.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/p8qurg67dmpngr7kpeqjttrrh1/80082130373.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e26212e73---voxapudenotatutivetorad.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/41773065075.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/8640497367.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/40227543934.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd879e45d22---dedafowosoverofojizurov.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/zijutofikulajiwiwar.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/88937203679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=okyanus+yay%C4%B1nlar%C4%B1+9.s%C4%B1n%C4%B1f+edebiyat+soru+bankas%C4%B1+pdf+indirPDF 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_off0000b830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB830 17296 bytes
SHA-256: d98a0b5bcc57fb508e934c556029cef3718bee54a11e6dd967839668c734c806
font_01_sfnt_off0000e166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE166 11244 bytes
SHA-256: ad4c689676b845ab21098243cc48e625674b3a259c95fc5cc1fff76e17d00915
font_02_sfnt_off0000fba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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