Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7533168ee311fa0…

MALICIOUS

PDF

73.7 KB Created: 2021-08-27 15:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99183c94157d4804a4f3be7a1589ca9c SHA-1: 37b9db8e9126c51508c71a28bbb79095188ed70a SHA-256: d7533168ee311fa0b06d749564470fb931a6dba59818cc1a72c669522e59bdc5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting services. These links likely lead to further malicious content or phishing pages, aiming to trick users into divulging sensitive information or downloading additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://allytemp.ru/uplcv?utm_term=parallel+lines+cut+by+a+transversal+worksheet+answers+pdf PDF link annotation
    • http://abwrva.com/uploads/files/68100698042.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae69f60cfe---45625843411.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2beb83ca5---vasadituzuzibu.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/jqtbiehrdq13si1vs1iccnvt74/69971400649.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/61549497456.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/5bb0b8e24d43ecf5af096f43f1c2c633/80824751121.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/2ee0poum9eodl98qpseoo8ht2r/41417821517.pdfIn PDF document text
    • https://bselink.com/userfiles/file/bejikiduteru.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/b9f78efc67fde0eb070dd1d5df589fa9/59458150644.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/87356196514.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6d2b3267d9420d823a7721b71a11d55/77958228085.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/8198449305.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083d8e7854f8---5920566572.pdfIn PDF document text
    • https://aspirans.com/files/file/87768546039.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/kavanifawubajubevigax.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6409be243b---kupumiw.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/92273610449.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/suzobarakemusilunuwuwosi.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/refutunasomoxe.pdfIn PDF document text
    • http://wych123.com/upload/files/zuwinufukeluvosop.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/i8r7s4lui7ooj325hiifkeavi0/xexejezudeligasomodonoguz.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/fidugubata.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/55208e92c1a2fcd055262ed7a4b0676d/7872909628.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/69667468299.pdfIn PDF document text
    • http://coatsofarms.com.au/ckfinder/userfiles/files/71103359432.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_off0000bcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD3 15924 bytes
SHA-256: 10b28c9cc435819b5fb327372cab3b6602f6fcca4a27651af2aa3b4197bf3f5e
font_01_sfnt_off0000e57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 11316 bytes
SHA-256: caf62c3091d208c9bf5d785af6c1e7c53c549856e835346c487e5ca245cbbdd8
font_02_sfnt_off0000ffe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1