Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a56eb6ab0cf4724…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 16:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d45375427a8f9f96ab2566953ace022 SHA-1: 8a185037eaf3f32aa55ce1de7d9115afe974811a SHA-256: 6a56eb6ab0cf47243c9b6d174fb538d8f228b8b59f40cb36a8d5b2ca8a57a8fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains embedded JavaScript and a large number of external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The primary goal appears to be tricking users into downloading further malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=pan+card+apply+online+form+pdf PDF link annotation
    • http://cleangroupbd.com/ck/upload/files/55899395137.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ed3c40ao8id6e7k0t23d9klhg4/lixotu.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/bidsc4gcji5um6hhq50rk40657/2989850117.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7f234099---47569170774.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/xinazasasudogixowip.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/lelanizo.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/pujovupofusubexurix.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/797547ee1686307a1ccacdad11c1ed45/lefebodotasikavalomeri.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/61418124692.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/nj80132s4cvc511j39nfnov7k7/jimaxorexitatos.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/3vkiarc9n4e7gmvhjl2jjppom0/95572821372.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/re5cj8k0qtdf2ig8osnme492c6/24144132824.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/jd3episcriq122pvioikejortp/luzijokitajumepiguwimased.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/kesit.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/b7qh8p3bpih3p86f7fpf3is7n4/gufejabanukawok.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d349cc3e3a2---pijegetemasu.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/35060727274.pdfIn PDF document text
    • http://aweibel.com/Photo/file/rojudedakoxaz.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/nereluz.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/78644980691.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/6393645833.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/40326552624.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/doaeapml7ctrlj4umepv4vjoi6/tomedamirur.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_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 18544 bytes
SHA-256: 4b6d571c344ff633bc62dbe0ec3a428597f554720603e2ef241f67082c469fdf
font_01_sfnt_off00010e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9C 10632 bytes
SHA-256: 10f8d5cbdb02393bbb6f2a1cddc37956440ff629694f5cc62a0b2f9eff3d07c2
font_02_sfnt_off000126e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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