Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d62092d5e6a6620…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 07:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e86871a6017e68b47e13ca1509a4f81 SHA-1: dd054f3b0d5be88b06e96f6ca4ae16b11162bf8c SHA-256: 0d62092d5e6a6620d793e776ecfd2151f0220b7c209050bcfbc6a49caca6481b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. This suggests the document's primary purpose is to redirect users to malicious sites, likely to download further malware or engage in phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=the+elements+of+style+pdf+download PDF link annotation
    • http://stapper.de/sites/default/files/userfilesfile/dejexoviboniroxu.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/jikanedo.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/vinunuxaton.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/dukenulolawozo.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/sofopilofeni.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/makegasixusotived.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/xukopigonilujezavunibe.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/66575708417.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/21570713327.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/81143401016.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433f6ad4c5b---batakaxizupijekis.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/50012493020.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/soniwigabiba.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb2d190b21---62031848925.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161443dbe5fdf6---23038377244.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab6cc4f69---79572161502.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/81404941663.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/22126010904.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/42006847161.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/5728951142.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/wabajikorizasunujuzobije.pdfIn PDF document text
    • http://splogservice.ru/content/file/bovuva.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/73872698673.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_off0000ce76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE688 18596 bytes
SHA-256: 60b1a0cfa4ef1c38f542886ceff9e02b9bd71aba292900b76e3392977bbfdf78
font_02_sfnt_off000116c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C4 10732 bytes
SHA-256: 7154439ce34e8557028b4002b373cdbbb84e59a123f47d2976c203ccde9394a9

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