Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b97459ebd3f8bf…

MALICIOUS

PDF

74.7 KB Created: 2021-08-10 21:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ef5802fd89a354191ddaa87bb9b7d6b3 SHA-1: 234469aeb4fa82e8cac1a1df729f9f2aa1a1fa18 SHA-256: 76b97459ebd3f8bf86de04faf3f04cf39c66dd9ffad289f9236560c43d4fbe23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple compromised CMS upload storage locations. The PDF's structure and embedded URLs suggest it is part of a phishing or malware distribution campaign.

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://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fdc263f118c---68121741628.pdf In PDF document text
    • https://artlabjo.com/userfiles/file/37041538450.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/92486119019.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/4723142738.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1cc330c2e---51888923503.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/fofovijog.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/zobaxi.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608002be6d00c---3495032664.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/jazotituduvaxufinanexulev.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca981ee223---refufobenisen.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/eknspd9cj2ql77u7ou7bu4mnn1/85499828367.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a44403581---15884719010.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/924c1095204ab7ea8bcdd6ff412ed9ad/97549110218.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/judosikuvoparasogapapef.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/baxerapoza.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/cc5292f75dd014c7657f6ca461a320b2/lotufusis.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/10627819709.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b96ca95e8f4---gusivolo.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/88b08e64a95f79a4caad42add471e99f/60643137425.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/rixomulawim.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/50240997237.pdfIn PDF document text
    • http://fittbike.hu/files/file/wozibofuteva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ejercicios+de+formulacion+organica+resueltos+4+eso+pdfPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/51175551218.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_off0000bea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B7 11252 bytes
SHA-256: a5b35f2508b07a7b71c26f3fbc609dca97387676c7f4d745aab569b46f1777dc
font_02_sfnt_off0000f0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 16648 bytes
SHA-256: bd39e88d1d12ef6f600f65fba6d92a7b2bf9049f00e87a7275c786b852c8d449

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