Malicious PDF — malware analysis report

Static analysis result for SHA-256 19027b0f31496909…

MALICIOUS

PDF

89.8 KB Created: 2021-08-05 09:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cadde760fbd7538a913ef79e00febc1a SHA-1: 8dba704b4331305700073b94492a6368490c177a SHA-256: 19027b0f314969099fdcacf4bb41de9b39c910ea88c1d6d7b6ad8e389ee5c16c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9678

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://ludifrance.fr/userfiles/file/15846796386.pdf In PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/gedagep.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608817bd373f2---17634333870.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/861cc9c464552f8d1f49dde1dcfc7305/panaronopamubawazenon.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609466bf76cf5---83521040715.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/rewisoxadig.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/17n2quilhn38j8447fro8h9eh0/solikovejebumasugoketuda.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/77420492361.pdfIn PDF document text
    • http://stroi-sistema.ru/img/wenimifugeb.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/nexanugajazijewitenuf.pdfIn PDF document text
    • http://ping-property.com/user_img/files/rebudiri.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/kopasorotimutosu.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/b1b738eda19c65922d621a6965d06f69/jawuwifuvaziviviza.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/nuruxulafibexito.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/7307086081.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/c58a00d54b2b212bc9d62904b83ed82c/45236243094.pdfIn PDF document text
    • https://panama4d.com/contents//files/33329700093.pdfIn PDF document text
    • http://kururlaub-ungarn.de/bilder/files/48770586605.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0b13d41e3---12136417676.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9c3a91fb5---nibatodeg.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/63b2cc6c0814f272276f9e6f85f2a8f6/nexexojamu.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/67149490857.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2871b967c747032c147743956028ce5a/47812031017.pdfIn PDF document text
    • http://digifast.cz/userfiles/60208086839.pdfIn PDF document text
    • http://jarosi.hu/files/file/kunidojunarofofikukoz.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2bff7bcd16530af4d7520eb1dd846cc/wipazom.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/3725b7f16b62d9bd967c7a94bd115571/19957226239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=descargar+samples+de+reggaeton+para+virtual+dj+8PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 18540 bytes
SHA-256: 8017a34b1d6e1b3cfa085e62b9d138fb30d2efa531fe1e3701e30e88e1c91e47
font_02_sfnt_off00011d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D62 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_03_sfnt_off00012597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12597 11360 bytes
SHA-256: 68d666c4ef0a0de582c55a6a3e51209881c1ddf90039636013224ec2ef95e339
font_04_sfnt_off0001401f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401F 17056 bytes
SHA-256: ef83cdc43146def987759f24b03ea1ceed1df19434f70b0660c8531d1ded940a

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