Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95329721aad0253…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 14:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af839368c5366d9cf9016d164647b1b7 SHA-1: 57eedfee3faefb1837825ca7c33593c42ce56eea SHA-256: b95329721aad0253097d2547b355d3c9fcd55fb8695e13632e4b153434fc0029
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. The document body is heavily obfuscated, but the presence of PDF_SEO_DISPOSABLE_LINK_FARM and SE_CALLBACK_LURE heuristics suggests a phishing or scam attempt designed to lead users to malicious content or to solicit a callback.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://miraclechuppahs.com/userfiles/file/49917763168.pdf In PDF document text
    • https://muzeumkonstancina.pl/attachments/file/53135760468.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce4fdb2800---43830763150.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/3630703180.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/42017877148.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xizifajarumu.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/moxebonugodawomixaso.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/d1dc19d3bfb25c1c7947276bca0e7df1/57143681471.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/46919298000.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/dubufatizoxanomojix.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/84649853313.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613772c226e33---54800898777.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/13738235120.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109031329557137.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/jufilojezamed.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/zilidokije.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/1896599774.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/desuvike.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/127831419613cc4d9a2911.pdfIn PDF document text
    • http://signauction.net/userfiles/file/54212875571.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/956e9229d7bafb78859c93717612426b/43042096457.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/ligetenen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+turn+android+auto+offPDF 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_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 18548 bytes
SHA-256: 315b994bd4911480569774f84837173451800f1832fa01faf529ac53d75db683
font_02_sfnt_off00012141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12141 10176 bytes
SHA-256: c59a4c86ce48e6d15eef5ba43fff19a2c4b347790cb3c16e4e96fdb0784f1419

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