Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e76996ba3e71df…

MALICIOUS

PDF

91.3 KB Created: 2021-07-02 18:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0602f4b0c087782c3167f80088b6ee3f SHA-1: 6b1d6020a05f71085de04bc16626150942fba116 SHA-256: e1e76996ba3e71df470e8adfd14c5c5d1e4eae0a84ec9bf7335ed902398e78e0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the file being part of a link farm hosted on compromised WordPress sites, with URLs leading to other PDF files. The document body is heavily obfuscated and unreadable, suggesting it may contain embedded scripts or exploit code, though no specific script content was extracted. The primary attack pattern involves directing users to these compromised sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • 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.
  • 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://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fae63b852c---vozaraxanidatumat.pdf In PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/dudulinobozivatu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef36cae0a---67621070183.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/aa064a42a607c636fe36e1b89ef748d2/tupak.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/74912876240.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb53ad802---60011916158.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/22245859130.pdfIn PDF document text
    • http://dgjst.com/upfile/file/gidovoju.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/lefasu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160860ee6265d0---1413685606.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070fd5ad8a78---wutugitisekox.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/gikananawogurur.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/sunafibosi.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/denurokevor.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6cb3180a3---81100237023.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/745ddf7de28a4702f679e2a03f55560f/94029280744.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608059ad7162b---26972582740.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/wudemen.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/37743587629.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/f7fdtia8mp7als826m6vb1djd9/bisitetumivogevuraro.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c8e03007360---21714474235.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d500c68bbd---21544630925.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/nebokanibexolapozusasabu.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/bf5140fb22e9db6d3d42805867a54a4f/tomugimisazivirit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=why+did+the+math+book+look+so+sadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_02_sfnt_off00011842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11842 17740 bytes
SHA-256: 69f1780e9cfa5eb29bdf2badd2dfc169319ab4da7c12c0bfe1a78e8f542a8aa6
font_03_sfnt_off000146aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146AA 10648 bytes
SHA-256: 98dc18c9d0dd817d1f454fc0a96557e216f89fa99e28f68a9d509edc71798605

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