Malicious PDF — malware analysis report

Static analysis result for SHA-256 eacf97802a553c60…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 15:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b609904000ad578af56c2852a8f34737 SHA-1: 3883453e1b060421d7b51bba0e1a2a07e4f92c4b SHA-256: eacf97802a553c6058d1453ab84d381f5db273a8f437d34851ba23be0b41cdde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous URLs and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=how+to+determine+number+of+protons+electrons+and+neutrons PDF link annotation
    • http://hpmcfamilyreunion1968.com/clients/83891/File/3563187285.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/0h0jnajcviaaq9imb8gg731kn6/xasibigotiranurafejov.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/5333976573.pdfIn PDF document text
    • http://cloverdiamond.com/file/97089007719.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/274dfe03d2d4e6aa5c73c9a3e50f0271/52982434731.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/37335612765.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb314c8ccc7---37708547200.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/66366028584.pdfIn PDF document text
    • http://terminsk.by/pics/files/silojasukujimarokusudonij.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161038497d60c3---43553969004.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e5707b81279---vopexurixu.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/fb029f1a394d33d5f85f35dfd6440532/jefukebitifuwarir.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/74974234689.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/17098309202.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/4h19c2id7ui7je56acsohued3l/limebikamuregezutupuruvi.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d4dd2063c---87085296376.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813f1f20c6c---bumone.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/bubojoxa.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/30669158463.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/7069012649.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/bidegotu.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/xunatamizi.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/20523619262.pdfIn PDF document text
    • 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_off0000dec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC7 11100 bytes
SHA-256: f2b94112717216fa9fe3ed810ac7e9c5a2b69a860d7d5383a91952607271039a
font_01_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 17400 bytes
SHA-256: 52cb457f30b8bd6ef339bc53f9786db9ecb6b1f1a2f6fa3a8e1c4c894f9cabe3
font_02_sfnt_off0001253f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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