Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51d7b09fefe4861…

MALICIOUS

PDF

76.3 KB Created: 2021-09-11 00:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f45a9bf5187f1a8fee9c66032913c04 SHA-1: b2a8ede37073514530f93ee778fe795e5d23c74a SHA-256: b51d7b09fefe486134e24f07224d6ac05a3ae13a74a4e8339a24e38dee543f8b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document prompts users to call a phone number in a deceptive context, aligning with phishing or scam tactics. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to trick the user into initiating a fraudulent transaction or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://smidgel.ru/uplcv?utm_term=pokemon+omega+download PDF link annotation
    • http://tele-klass.ru/i/upload/files/xerurofavadujag.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ee17d1693---62184081203.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/26495e2786c5f40921d91a5049fbb0a7/samefun.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/50636439952.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/03a2efcfb2ccd5bc00f832e7e75db298/petefigodu.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/38441032235.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/4064342375.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/pegapevorupijakuzosu.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/xavujigitoluxesazaji.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/mugimeneza.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/dojurepifadidugevofumaku.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/pipigavezepetidubigajar.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/polajuranokaru.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/46840838871.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29835739910.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/33810293812.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/430214865.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/kukolojumase.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/pisilebu.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/70858928538.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161392d0aabb89---kajosoletogarenazinus.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/bumojunefituxo.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_off0000c4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DA 18036 bytes
SHA-256: 201d6ea3a3d6d8aaddf70a3694f1f1857608100b901b9922565aebee0edebdf4
font_01_sfnt_off0000f493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 10312 bytes
SHA-256: eec4eff4a47e4875262dafbf75221789ec32562a58cf7cb81161bcb0c637b327
font_02_sfnt_off00010ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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