Malicious PDF — malware analysis report

Static analysis result for SHA-256 695a9e6bf82d5a95…

MALICIOUS

PDF

122.9 KB Created: 2021-09-02 23:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f58bdecc56dbd635bf1f15defbb8e132 SHA-1: c03a8d47ca2a2c58dc056b5312e45a652009efff SHA-256: 695a9e6bf82d5a9524447fac0b5396ecd2c7ab1be64d1542a639ab93181b164c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the PDF is intended to lead users to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://inwebjor.ru/uplcv?utm_term=compress+pdf+online+terbaik+500kb PDF link annotation
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/dulefofewapovulu.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/loduguxirufaxiruvuta.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/h234v046v6p58b05qff6qjklt3/getanejukazisala.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/84c5f38007ccb23d122a87542cb844c2/6382512387.pdfIn PDF document text
    • https://thehouseproduction.net/file/nudobibovatenibus.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/vh714u0djo58l85600ll7kq92l/85546446313.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/mugulapuriruforu.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/41149169062.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aab17a093---4204555829.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/62510902829.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/362369818.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac3084b531---xukilidavojoteg.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/0ec14a075ff176d4d160a34af159c2cc/wasusejatogabuvusubili.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/pigaxaz.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/21479690950.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/ium7eellne7km2kg7n7bt6p7md/baxuloxukadoxu.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pim30cul9d891gv0nme4pgrej5/27720904477.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/28222224530.pdfIn PDF document text
    • http://4bx.pl/public/file/89200882777.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/86a25eb8b983cfb5c3feeb407e47c8db/37965387471.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210522073302163.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/61702549485.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_off00017221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A38 11180 bytes
SHA-256: ece700dc7e3abd59d5c54ba7284eddb8393d1af45cde7a3845fccb857c9c033b
font_02_sfnt_off0001a424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A424 21748 bytes
SHA-256: 40ba2d30c98a6654f207c9cd2336e7f91a90e8001547784dab1f26ad90ad19f9

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