Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12883af6d6965dd…

MALICIOUS

PDF

91.1 KB Created: 2021-09-02 07:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 52390d1e8c0849a1b741aa372d87aaeb SHA-1: 841283122236570fe71d566a462324807467dcc1 SHA-256: d12883af6d6965ddd28a3fa552f1896e507e6c49ca79de30a5c6f0421fed33c4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many of which host other PDF files. This structure is commonly used to distribute phishing content or redirect users to exploit kits. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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 https://simondaulte.com/ckfinder/userfiles/files/8454783390.pdf In PDF document text
    • http://langfordfinancialservices.com/userfiles/files/96459797801.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94fad7cd84---difomogixomiruzuzovi.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/oq8jgie1ju4j06sekfvpfqq4t3/nivegadudinexusakus.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/38669271886.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/63476449750.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/46256396093.pdfIn PDF document text
    • https://advik.net/userfiles/file/54089553321.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/cgl2sb14b112ah9gsucdi0hsaa/lisotixevirojatututikow.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16121765242fd4---mivud.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/9ec84f136d12a31cf187d5fa6d34dcc5/2885478400.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/raxejemotivetedetivegira.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/kuvejelipekimopiji.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/20790124330.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/82513791991.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/cl5kpkbu1iq3bbdppvvhsfkqda/murupiwisa.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/37820104666.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/88586274322.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/65102463995.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/69184949783.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/40710786107.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/8c6537945743d0ac5d3747363bc6b354/19988541141.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/1772038329.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea035d317---33020202616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+the+lcm+of+8+12+and+20PDF 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_off0000f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 20388 bytes
SHA-256: 02754f79669939bc8693b8c2abb8eae541539310c52075384b9f25997631e41c
font_01_sfnt_off00012c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8B 11136 bytes
SHA-256: 5017444b9071d8e85807b3ec9dbd2a77165ed2dbcdfdcbfbe0cefe7922b28863
font_02_sfnt_off00014677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1