Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb7da9ef785fc58…

MALICIOUS

PDF

91.5 KB Created: 2021-08-06 06:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a49ba45b349c493db2b4fee7c8de45cc SHA-1: cca4ba7946e50ed49a00f0204e9bb83e9ff1e5c6 SHA-256: 9fb7da9ef785fc58d8db9109812674d3c2b1e765315572d816e5072669a88a3a
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it aims to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/pn4ols91umcg4rgh58j4emvimg/28437280719.pdf In PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/zuzademonumunemisezur.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/jofoligoxopab.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/4a62585797b389ac9997ecd756e11de8/zapewidaron.pdfIn PDF document text
    • http://elearning-chemistry.ro/userfiles/file/savekuwarorokenenafediv.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/99449198787.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f45be5637b---gojekelobijunojam.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5e690f555---fufasejifafo.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/6vhkfl3lne99h6mc306mo0ihep/buriripixopimusuvegujit.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/97953069159.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ak7mk2jfa55q8tm540dsshmqv0/zatimegowobufenotekun.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/13c0b8c1a65257e5a93bce914d6b41a5/42514276225.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/gumologot.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5955ebb66---29540119328.pdfIn PDF document text
    • http://bakoca.hu/files/file/65729642163.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/89334162346.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/54282332276.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/zudore.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a24bb9e43---tanizekozoxisinigaxodimew.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/d0a36f0d2c3dabe50cb415eaf1369040/87432147462.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/favab.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/60858134986.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/tenobimeramop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=metodologia+de+la+investigacion+cuantitativa+segun+autoresPDF 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_off0000fe14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001162b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162B 10704 bytes
SHA-256: 6c7be095ce48a71fc8528b9109b05a40e68b5e59c808bc1532344bcdb20cd75a
font_02_sfnt_off00012ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAD 18596 bytes
SHA-256: 28efa90735a353941a86e96789d29373cfba0277b6a9c35f53a4ab69c740614a