Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35493b6414d4ac1…

MALICIOUS

PDF

85.7 KB Created: 2021-07-24 20:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9c264fe55677f8f1f2dfef5e8dae3af4 SHA-1: 51f4d1d75d9d47d9be71a37b37a513303b3f57e7 SHA-256: a35493b6414d4ac1da47b9dd85046438907e2153779863f823bc546f37597a48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised websites and potentially malicious PDF downloads. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to distribute further malware or phishing content. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/9bdc66aff3428c0096657b6bb05ffdbe/82319219872.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/ditulove.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-24/20210524192125677553.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/29439229425.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/52232947555.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075f8de99072---87625409644.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/0bhkd9hc0rh4hm24dpq69fesi6/rivejubesitotas.pdfIn PDF document text
    • https://masihpt1.com/contents//files/posabelalexedowuzijimi.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d1692e785---dibil.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/pukajujatemubivaja.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/16079989145.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/074a99d1dfc892d1432df18f9d67ed53/zufupikazevomokamawil.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/3477415046.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/3540951807.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160808bcc60fc3---85028450480.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/wokedidukowibagopaf.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021628225964514.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/mokikubokenusadipuwevafox.pdfIn PDF document text
    • http://airsoft1.ro/files/file/86389139781.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/kubapukojafib.pdfIn PDF document text
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/82921352754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ray+tracing+minecraft+download+javaPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A4 17348 bytes
SHA-256: c2e8dc11d6f0b6ccc9c4b7512322baf7c8121a2e79ae41f3e5c3c74b0a72d7a3
font_02_sfnt_off00012fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA5 11092 bytes
SHA-256: a6dfe521c065f85f86e72f070d3d0083e05daacf3077df048243133e8b8b1412

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