Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a90532817d9aaae…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 14:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ce667faf401795a0d85c4d6c56fbae2 SHA-1: 9896d148786d08c7d1ab08003d5bce7e383dc71b SHA-256: 7a90532817d9aaaecedc5be58ad298675936a1ca4887c67e9be8b9aadc8dd771
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed for SEO poisoning or phishing. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://edu-family72.ru/content/images/uploads/file/tikuv.pdf In PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/9411295610.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/kotekafemetuvovakuzegisil.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/90204721252.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/fujimaforefedete.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/rukomapuvativibataduneju.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083633eed33e---31121199723.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/4f593ccf121fb8c9c56199861034118d/45460992265.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/tesavezuridadi.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021072404135073499.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afc0d61f332---gokid.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/28732531615.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/17029590735.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/bewenum.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/v1t6gn0qhha7tuq8kt859i87et/wirudexagerirojo.pdfIn PDF document text
    • http://stl-hk.net/userfiles/2640012326.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/56409389655.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/65859793378.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1b0ac4f665d16b90f8c6d2e8507ac84f/wenatuzuf.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce4ce796fc---fatavavijug.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/witawitajotiravoruvabaj.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/suwom.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fccff4a4b18---tunawanawazema.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/62797d9956070c0925a03e88a6f8f671/bukerefoduposuzorikusez.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7f9f50a8539a1d838c9ece85c6430a9e/luviropitexid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=rising+and+falling+intonation+in+english+pdfPDF 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_off0000d5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F2 10724 bytes
SHA-256: 3080f7514ac6c42a1f9674bcf0ff30a559f41d58d59c1d02451ea1608bf7b4f8
font_01_sfnt_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001065c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065C 19076 bytes
SHA-256: 9277c97d109cd865fb4ac9f6990a9c9d184b6221d637fa7a4dd1f034f211c9d0

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