Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aad7908dd107097…

MALICIOUS

PDF

123.5 KB Created: 2021-07-01 10:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 751a94157c21cca3c80238a58ce6fd68 SHA-1: 6353a35c6cbc614b227bffaaad1a9af9a6bae9f4 SHA-256: 4aad7908dd107097f7a6331afab1b5d616f3c2f975188ed8634efcd0ee941ade
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=notice+of+deposition+template
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aacb03a9c53---78973063536.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/94465894883.pdf
    • http://www.cerathai.com/image/upload/File/45306299383.pdf
    • http://chunmianxian.com/upfolder/e/files/20210622153138.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/beccd96cf8f8ddedae42a06e2734679f/tigijitoxamuwubikanezuzis.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afb8445ee53---lukewavuwun.pdf
    • https://ludifrance.fr/userfiles/file/40000170013.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782d5bed0cc---44432978867.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/10c57dac7c3d48046e37fca2ebe68a27/24677556942.pdf
    • http://shinies.ru/img/lib/file/zituvefufazujinuxojex.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16dd0a6981---pewadanibevonad.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/bfce06eea36f64efb00730e8c6a7d268/71347373101.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077620480641---24039928978.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160afdade3dcfa---jitapijetajikibetabepoto.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac15af49e3e---relogijimibipusatupukak.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffd6193002---9283125275.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f635bbf136---fitusagin.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e9fc792e0b713c310571ef2baa50951b/nokazewuwana.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/s7t8cn2pbsg8af4fpfei8uhe85/55763949666.pdf
    • http://petra-dario.info/upload/datoteke/kutebawakopepe.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f293c2db99---23741116273.pdf
    • https://a2designbg.com/userfiles/file/52872811327.pdf
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/majavodexumifenifoxem.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b45b9f873e9---fufirawodewa.pdf
    • https://ebooksweb.net/files/file/56984617053.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018008.bin
e9b0d5f6e6bd75afdefde13a353425caff73ded1fc2ea8465cd2f9327b46d276		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18008 17496 bytes
font_01_sfnt_off0001ae3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE3F 16792 bytes
font_02_sfnt_off0001c656.bin
04a3f4d11022b2b9cf1b728c8c5a623c2c511fb31666b0182a807b7839c32780		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C656 10660 bytes

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