Malicious PDF — malware analysis report

Static analysis result for SHA-256 5532eabb26d69a3e…

MALICIOUS

PDF

76.4 KB Created: 2021-09-07 15:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 1b67fec9a9cc63d0e260fceee58121be SHA-1: 902f93f9915a57264ef8e5fb17844822e7730534 SHA-256: 5532eabb26d69a3efeae7ba77df878c9224820fc12409b0e3b7de2ec8e1634c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of numerous links pointing to compromised CMS uploads and disposable hosting, coupled with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=section+15.1+the+composition+of+seawater+worksheet+answer+key PDF link annotation
    • http://vladjurnalist.ru/archive/file/66979465356.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/86881778961.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/nebiwubifixu.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/eac4h3mpk0dpdri9pc5a6thet1/sewawimejunuger.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608841f37038a---52696635340.pdfIn PDF document text
    • http://apsons.eu/files/file/nevelawewesawomepevaga.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/0e0627204683525328c40883c7f971b7/53913139828.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/77471194330.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/2850c13170d0b6b4b314e5697e8a47d5/kiviponamerara.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/8170082745.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/924c1095204ab7ea8bcdd6ff412ed9ad/97549110218.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/juzepurukenu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/885dd6503de2ae50bac965bc88efb311/wuwegorizajigubur.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19d9ce0789---19298555432.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160788d94b2ea4---xanovubabukalulokikexinu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/5a90f4d280f4f33f10ad14dc5eff133b/sowovisanunusepamiduxemaf.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/bf7b0eca719524b8a5483521bba0a67a/pewimosaxer.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/pikixevaninegi.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/vimadotodajiko.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104d2d2840c0---36269151659.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/pinamozusi.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/0f1vh8bumll4f4mkvdk9pc9btp/50299173831.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_off0000c377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC377 11320 bytes
SHA-256: 154f744b839d58bef5062d2b574ad4450d7940dee895135d04dca93796c92323
font_01_sfnt_off0000de13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 16948 bytes
SHA-256: eba2f6ca60b8d14fc1cbf1b6085febfb2a9a04a720f592840c4c33dd7e826739

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