Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af93c548a496abc…

MALICIOUS

PDF

88.1 KB Created: 2021-09-10 10:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b8e42aa5712f333b41909381bbb4bbf SHA-1: 10825b6552491c33fc63f3c978f34d40f9cc8d5f SHA-256: 0af93c548a496abc80d7a53166c81eba1d6034bc2423a46b0d910844adc928ef
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. The document contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting an attempt to distribute further malicious content or conduct phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://maudchristan.nl/ckfinder/userfiles/files/nikefedijejuloke.pdf In PDF document text
    • http://canshu.dlzj.net/upload/files/20210910111119515299.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/87074791219.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/22394554228.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/nodenipasezosipalokelewe.pdfIn PDF document text
    • https://emenu.hu/editor_up/jivisizokuvu.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/mowisalononoxez.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/61cb33077d1a90d138e06b3bd6af8be9/muxubajakatejolesarapo.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///kowuwokaruzutow.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/46447543281.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/bisuxuxinipet.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/purulowomug.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/serureratezeweza.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/73405143934.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/72619895729.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/vomot.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/82065870984.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/diredovoteworiw.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e773b9a84---38160223484.pdfIn PDF document text
    • http://veitali.com/upload/files/7801839337.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/af2f53c2a9fdbce3e3aeec7b7e137db6/robenujulojuwarimosobe.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/41512977118.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/leluluxofirezeju.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/zomuninowibidivot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=outlook+on+mac+not+searching+emailsPDF 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_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 10896 bytes
SHA-256: 7421a52b5bedf0662fd2f9c924aee0d4e9ae27c6100093b2c6e1e0ed85ab7f09
font_01_sfnt_off00010a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A33 18720 bytes
SHA-256: 5d5cbe34ac5655b6745f01889e80300db6a814a07c46cd15d80d028214bd5808
font_02_sfnt_off00013aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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