Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d98f23f8ca6667b…

MALICIOUS

PDF

89.1 KB Created: 2021-09-03 19:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c0362c6d2e6e6d3b05cb0e1e64d1360d SHA-1: d4d3e06479e8564da38bc1f990c2b9a034e90333 SHA-256: 2d98f23f8ca6667b655bf2b0ff4cdfa6d3086634b849f1c677f4ee779c4703e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/a5jj3ah5vrjqrjpumeugeh3ujn/75278910259.pdf In PDF document text
    • https://widepolymers.com/userfiles/file/dejemene.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/1945580164.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0f37364c7---23761134199.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/80955648538.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ujt4treohjiqld4pbnc2j9ep0c/maladopajega.pdfIn PDF document text
    • http://szhlfz.net/upload/86907470824.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b58361701a0---xowutagevo.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/23339133576.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b603f8e9e36---kolijupuvumedakarenifaz.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/94982196064.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45553cba43---86264830783.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/51381478493.pdfIn PDF document text
    • http://df-foundry.net/d/files/24735914051.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/zamulipulifesida.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/092821bdf3b131d6bfcf342ab1ed58d5/49910420889.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d0445a4d0c18363612b844535b4a9b68/vururepug.pdfIn PDF document text
    • http://finvestfortune.com/admin/userfiles/files/81528627561.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/bivesa.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/8684606459.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/93533666924.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/pikelilezutuzevuluxapika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pdf+aspergillus+nigerPDF 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_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A70 20412 bytes
SHA-256: 4775dd73d9b9684a475ef3fe6e1b3ec32c915f06c46c4d88919073fd44357aee
font_02_sfnt_off00013f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2C 10556 bytes
SHA-256: b63e49c0d0b41b21b303dd10b4d802e583cdbd119ab79e6d87638f8ea65d10b4

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