Malicious PDF — malware analysis report

Static analysis result for SHA-256 948d67b22248fa1b…

MALICIOUS

PDF

82.9 KB Created: 2021-06-30 07:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8b8e749dd403eb91034bef153d6c6a1e SHA-1: 91524ea33b69367508158897d87b49d533b21aed SHA-256: 948d67b22248fa1bb5cc16538a8d08656a830be7898da970c7ee354a93f07be6
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious domains. The document's content, though obfuscated in the provided excerpt, likely serves as a lure to encourage clicks on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • 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 https://haltia.mx/sii/ckfinder/userfiles/files/93195670298.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5de1c00597491463425f7b99fa486103/gevigedomizarulofaker.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c75492885d3---menenorodubapolirov.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/6s2187girem7gq3qija9fo5kse/16611280141.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/genusudolexozafogawelas.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/leio8c4uau2dehfqc1adluj6qc/pajikire.pdfIn PDF document text
    • https://slide-bearing.com/d/files/3808100863.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/vatudezamaxewevavopar.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/dacb4a964bf0aeb42092078d91cfebdc/68190697255.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/32823614823.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aae9a620fe8---6028654168.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0cb3cf97b55737a0a7c214cc10bfaaf1/fiwagi.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16078334896981---99187715487.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706d049b71a---71315343429.pdfIn PDF document text
    • http://greenld.com/userfiles/5463487584.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/69894028479.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/kazegavatukopowemumefokav.pdfIn PDF document text
    • https://wsbtitan.com/images/file/61989230471.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/bf59946eb4992d69b73d0d245f5de9a1/vilivupodojidi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tatotasuxasiluxijesi.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f621ab77359ab943784007469aec7a69/xerupazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=class+7+worksheet+with+answers+state+syllabusPDF 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_off0000e18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 16752 bytes
SHA-256: bb2dda2e9b92f0fe3e1703b0939a0318876d5f623a9197ceca3977d9f2dffba5
font_01_sfnt_off00010d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D36 10816 bytes
SHA-256: 38fd1c893990e313078d90280d219f42e0435d080c2d8a321c65fdf0b7d558ef
font_02_sfnt_off00012648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1