Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a1a5f842f889b8…

MALICIOUS

PDF

87.7 KB Created: 2021-08-03 13:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: fdb246ad48c1706bc1d31aefbea86113 SHA-1: 4db9c397a978027d46e80dfa7857d6632b54f47a SHA-256: e9a1a5f842f889b8f9e32f88c0370ceb914dbd096a47740bdbf9fe478574a504
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 ClamAV and an ML classifier, indicating it likely serves as a phishing lure or malware distribution vector. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the ultimate destination. While no scripts were explicitly extracted, the nature of the link farm implies the PDF is designed to redirect users to malicious content hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soles2walk.cz/data/file/77462972073.pdf In PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/9d650c3c6985496f351beb827d249ebd/43876365709.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/29016969674.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e79c9661e66---jidubilivowusax.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/56168657221.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/70bc71c1de8314dd47b4eaedcaf6c90b/70891598723.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/wovirew.pdfIn PDF document text
    • http://ashioke.com/images/library/File/goluf.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/81150670736.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/wurenidesowufuxik.pdfIn PDF document text
    • http://abwva.com/uploads/files/77211773444.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/fote5337rmd43c551k2c92i1u6/gixivin.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f012c41a8ac---gepexibowopizul.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/91504130447.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/dunodi.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a29babe8ed8---23555879013.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/funavipomemopunok.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c61e48c929b---lelexetibamaluf.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/27206672450.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/18938031655.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/o9jch7nptn5g2hguftdqpmp0j8/kasevibokogifesotoguvelen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+replace+battery+on+hp+probook+450+g5PDF 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_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 11148 bytes
SHA-256: 75e809b1da8f6f18b8235b5f2ae29781ec009de1b1e70064c827202ca8fa8779
font_01_sfnt_off00010a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12212 17672 bytes
SHA-256: 7a9b70085c42bd71fca3fa122bbf726507ec2f3c537183fd141d19d1736b1f81

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