Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b22b55c04117d4…

MALICIOUS

PDF

79.7 KB Created: 2021-09-15 20:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f7aa4508cf44fe6f29f729fcb3de8e9a SHA-1: a1f7d530841276e61d8186581e2ccc98ad75124f SHA-256: a9b22b55c04117d49e5e83fadf0e12ffecfa01d5fd90a953e1064ab0ed9e76ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/3tps833cho9mfdm34csi0lgkrs/katiko.pdf In PDF document text
    • http://drentmedischadvies.nl/uploads/files/78697467267.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/dasij.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/dobevorelezez.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/0f62cdb19c2ff75e0e6c2d942427cd14/42100860313.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/kubitirujodanogejidak.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/lulujuripuvaseratipiz.pdfIn PDF document text
    • https://suncables.co/images/file/nujixedufokegujijefoku.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613033af29464---50783818794.pdfIn PDF document text
    • http://sireny.net/share/files/tixukakejemezevifeg.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/33lrqg4va2jhnrkmo1beg70g6v/57304908806.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/3fcb00b739178ebbd902ef5d1c116837/dikagin.pdfIn PDF document text
    • http://attlas.center/userfiles/file/54441676551.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/34229249122.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/94351420481.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/jinojilenoxifixipagebojug.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/14160949380.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/lowiselabatu.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/fekafimuginaroxagabo.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/31306406237.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/19197879204.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/92769217336.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396824b043a---losiberuputudeto.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/15215218984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=location+services+on+androidPDF 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_off0000d2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EF 10340 bytes
SHA-256: 688fc6a5c2825081ac9628cf64ff9e8872c97cdcbb926cd5cc012cce7bbf6127
font_01_sfnt_off0000ea6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6C 17992 bytes
SHA-256: 8fcf829f7e034b5072828fd15dfce3e950d07a2aba00a91f4a905c10591ef248
font_02_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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