Malicious PDF — malware analysis report

Static analysis result for SHA-256 740f1a6323c9ceed…

MALICIOUS

PDF

83.1 KB Created: 2021-07-08 17:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2a401ec5bbb4a51b06df07c2734cf9eb SHA-1: ec38c63f9a1d33c12c2add3310c399b667b89d2f SHA-256: 740f1a6323c9ceed95f7c86680e96787c6381b85a99ac1762efb750d3221033d
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and contains numerous links to compromised WordPress upload directories. These links likely serve as a link farm, directing users to potentially malicious content or phishing sites. The document body is heavily obfuscated and contains no readable text, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://universitecentrale.net/uploads/FCK_files/file/pigujarewubegoname.pdf In PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609c78257b6a1---zobukuxomalubikabupas.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982b5273a6a---nivifodesoluvoni.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ei1quv2t1056q3hbu9l709tnha/zizitamiki.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a392bc1bc77---83291403723.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0b10edfe0e6fe27546fe25286952b4f3/18989671470.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/93041766424.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/i2t50juv2k4eneucdhdjhlc5sa/90859395004.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/949b1837029eb6a2a2c3542058033898/fonuje.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/tukibofadajebuxasomelu.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/45349241108.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/59e1d06ec335ff6bb3d6c74b2fd3b30d/balelogavi.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b60315b2c---letoxukut.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0c3274ab4a3f18f4e64d466db3b36ace/55999749348.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e6b8b777f---44661154668.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/36879160046.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/2420a2de5fbd51e41d9163a5ddbee495/39074179454.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/e0359348f1ceeb0f2fec71c50d9e7b6c/dalinedesi.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c4df8a68c3d---5240152184.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69d99f3eb---23409456540.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/20497574543.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/bafegaxagine.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767a6689c82---rizerirokupalexelix.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb3002c477---24162867823.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/75588130370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=dolch+list+assessmentPDF 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_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 10396 bytes
SHA-256: 6c734b5efe076aee2293ef18b7f2d2d7008cfa852024a63db281a6f56473e93c
font_02_sfnt_off000112b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B0 16980 bytes
SHA-256: a3e86cc7d7fd87251f37b1ef1d60f4f60a406da7e9ead2c4535cf38b895bd2ae

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