Malicious PDF — malware analysis report

Static analysis result for SHA-256 806232b305697a0a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 00:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25bb825ba64a81c637cbc91ae275094a SHA-1: 90f3bd77e9697a1507c4fdd25de4bb2a2f54e015 SHA-256: 806232b305697a0a13c753bc228fa3225df1dfcee7cc75ca1aa3c157549b6218
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to other PDF files hosted on compromised websites, likely as part of a phishing or malware distribution campaign. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://scsytech.com/upload/files/piwafabilufakejukevupep.pdf In PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/vivomaxizarita.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eced72beac---jegixad.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/biwadotukofada.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138cfbb66b73---37041384344.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/88073513948.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/18552996165.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/v6i09e3jd3mjscqdjtkl7mq8ia/nuvizeparesojuworus.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/5847390478.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/21231223233.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/24354186185.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/99895254119.pdfIn PDF document text
    • http://centronegozi.com/public/joganafosad.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/15530130649.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/60142896651.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2e46b3c0b---64952143226.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/998d982555b9b00b85257084f7bbfad2/kagalujefakudajaget.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/32663703610.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/koxonaxorilawuvepop.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/rakuxevuzidenevudu.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/lusekekofowapatifiwowelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=%D9%85%D9%84%D8%AA%D9%82%D9%89+%D8%A7%D9%84%D8%B4%D9%8A%D8%B9%D8%A9+%D8%A7%D9%84%D8%A7%D8%B3%D8%AA%D8%B1%D8%A7%D9%84%D9%8APDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000b739.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB739 19704 bytes
SHA-256: 0ce75186a5351d16eee8bf25407819135b0d4056c7bf82f1fc37045834b51704
font_01_sfnt_off0000d7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BC 8984 bytes
SHA-256: 1155eef8b03fb48db8196c62fe92ea0367c3129ef5e52290f3da045cb9446085
font_02_sfnt_off0000e9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E8 18148 bytes
SHA-256: 071d70938f0006bd74cfc1ed47389b3e7e9d4c5d29315b40c47e820fa02d83df
font_03_sfnt_off0001171d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171D 18676 bytes
SHA-256: a09e5a0e63480743a422db108922b9b8b346729b99b782ea27bb6299d4761833

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