Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32bebe5688ddfb3…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 05:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ea7c25259470299f699d49fb29312c6 SHA-1: 6ddb268862231992d5d258cd85b108b75c53e088 SHA-256: c32bebe5688ddfb32e34b9d7e5acdb6cb1236248786d04fc4487e63df73cea22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm for phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://laborke.ru/uplcv?utm_term=photoshop+large+document+format+to+pdf PDF link annotation
    • https://ismet.com.br/ckfinder/userfiles/files/48888817811.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613be0518b2b9---94631506504.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/66030410999.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d71c4e8e---79089807910.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/27289568083.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/60359724062.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/40327902651.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/17669580569.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/27156913550.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/19053315140.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/26360336908.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/jesonikokolamelemaxum.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613630b29d4af---folese.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/waxajaridabipuzokusug.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/96217659815.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/tuwujotevos.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134a4826ce90---tiwujurakazuzorobeki.pdfIn PDF document text
    • https://grouptm2.com/contents/files/vizakisenemix.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/97712867673.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/3419605297.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/37068777480.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9872d1dc3967e348dd800e78552f4352/pajezowamipuvapa.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_off0000dde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FF 11076 bytes
SHA-256: 974b6f71ecabddf28360433926120577a41fa54d2b218f24782fbbcd1c21fb40
font_02_sfnt_off00010f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F83 17588 bytes
SHA-256: 8e748d0d4787b21b09617b589d770ba3f6d60dcf15112a83740144b92b54f2f0

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