Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc69e84ebc17e50f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 06:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e558abd56885fd5a5b66594be981e738 SHA-1: 46b93e1af2bfec8b411899e64de8ba7bef1c5323 SHA-256: fc69e84ebc17e50f69b511f2b0313ed75f260aa62ef530772fa7bb7b78af47cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Multiple heuristics indicate the PDF functions as a link farm, directing users to various external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://iveducentar.com/uploads/assets/file/89740889044.pdf In PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/50318221494.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/10081461893.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210913003715190144.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4ad211786c011338ae99710999a37334/86317002413.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/81770908417.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/11854952890.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/fuzivurawipekorexulujimip.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/73021574049.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/12537673757.pdfIn PDF document text
    • http://ruihuitax.com/files/file/ketikajezonufolibaju.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/52443247789.pdfIn PDF document text
    • https://pr-dienst.ch/file/wijew.pdfIn PDF document text
    • https://zzhqhi.com/d/files/5293762042.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/rubinux.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/zajemusikuna.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/jumedabewovasuloj.pdfIn PDF document text
    • http://ccadl.com/files/20210912222114.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/61940545850.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/15541057708.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/38646097813.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/5961086011514e6b65b19989d2fcc3e8/tewizajiziburodu.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/52858642020.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/lasarovinozaxolerojofoti.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/jevibilusugavivitivizoto.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614590a4447f4---96987325368.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/kiruvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+follows+after+trillionPDF 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_off0000d956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 10388 bytes
SHA-256: bc9ec205e2fb4519b9b315e99727c77908b1f40319546f5d8f61fd5e95c0215c
font_02_sfnt_off000108f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F1 18476 bytes
SHA-256: 3fdc907948050a4da287ee4b360e6055d1e43a884a5d1790c27fa784848db836

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