Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccab52714f778c44…

MALICIOUS

PDF

76.7 KB Created: 2021-09-19 03:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db4bd66c5797022e2faef8ddd5280458 SHA-1: 344c4848dbc8965d317808478862843bf060df07 SHA-256: ccab52714f778c44399c9fc5bf2bdf77e1afd55203cd72166bfdd4c4e85e0d6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://ivankotov.ru/img/lib/file/pimerizu.pdf In PDF document text
    • http://rileyillustration.com/images/agency/files/6599822979.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/52817985231.pdfIn PDF document text
    • https://techlan.pl/files/file/getado.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/39163689924.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/86882758594.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/redexumimozet.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6e5de7489716ff86425c73bbd6e9b581/nivumarunitugifaxad.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/22928311150.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/94287952931.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/fuzedutivejenelo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec5d4005a---99299241254.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/46943115607.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/nonewizan.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161465313d19c9---mupusewuvalikesos.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/6969331850.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/namufigozir.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/dijasodorumoponerabumal.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22429312814.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/bonid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=excavator+truck+gamePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 10504 bytes
SHA-256: 42d5e91b20a1c7fc1971fa452425e6b7c60ba17065070e0bd52c571472abe0f5
font_02_sfnt_off0000f85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 17400 bytes
SHA-256: 19a107f60873bd36acc4711099dcd558ff4d9bb461bcff6eeb0fccf9214eaf04