Malicious PDF — malware analysis report

Static analysis result for SHA-256 499ccee78f17d52f…

MALICIOUS

PDF

95.0 KB Created: 2021-09-18 00:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de4b002bf5192eb19b87052a899183aa SHA-1: 450546b8380fe8257ec37e407954cda8ec7718e6 SHA-256: 499ccee78f17d52ff0c1cdb1e37a52787a683630d145b50045fa37c8b12a3c0f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links. No specific family was identified, but the techniques used are consistent with a malicious document dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://sanchariglobal.com/userfiles/file/repelujigunosomof.pdf In PDF document text
    • http://sameiroeventos.pt/ficheiros/96205094227.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16145037f300c4---17546979148.pdfIn PDF document text
    • http://sergeybazarov.ru/file/73914930001.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/90128506817.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16144152252d32---54287304966.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/bamipifijuwi.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/raboroli.pdfIn PDF document text
    • https://tl-systems.hu/files/files/34565479532.pdfIn PDF document text
    • http://tykhchem.com/upload/files/39406762311.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/43757222802.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de6717e4d2---76596812306.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/hlf3mheq9f1ttdmkhj2ak6l8p5/zufefuxafajizalot.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/42832890429.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/093deb24c6060e8f82169f717fb0dcaa/79305294764.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/keduzoforatidiposudebidox.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/92200606013.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/48015921776.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/36363912447.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210906_FFAFFB5289E2DE51.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/90408961080.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/0b27e732fd23f30a6834954da39add85/rixosevirafexuworopade.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/dadulusafake.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/mokunaxadijasoretoxetem.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/gasogajakarovenizikov.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/tasazexamivofode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=eclipse+project+androidPDF 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_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 10620 bytes
SHA-256: 2a06fff3b4754089d324eedf5fc4128e464cdf96bd4209229f013685fce56e93
font_01_sfnt_off0001290c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001411e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411E 17152 bytes
SHA-256: 4c9ce7ccd59bbcff6655ed2bfe1267fdd61277bc5970b06f72200e4170307c4a

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