Malicious PDF — malware analysis report

Static analysis result for SHA-256 cddbbb35d6f8d98b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 07:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e1c7ab9e7370251fa2b69debec47ceaf SHA-1: baa310211730e9e8a5915420fb394d30a253b843 SHA-256: cddbbb35d6f8d98b26d82070a89dbdd1f57be24cae80fb79d0ca9e1e6929b454
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and other disposable hosting sites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be non-readable content, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://poexali.org/static/image/_u/system/files/16192125444.pdf In PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/kawikoguvexetipuk.pdfIn PDF document text
    • http://salespate.com/userfiles/file/44695498979.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105b29f83581---58077766496.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/rotosunokukexisulosiv.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/19855410198.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/belojisumabew.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/vexinugobav.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/qtphais2ko3f7gdrq8reug5aj3/7998335528.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609421bec44c4---xezikex.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be838eac5b5---31434059883.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/21169397515.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/59362313800.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/18021431171.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/s2226s29ollmuvrta9g9hnmvo4/tonezik.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/77b3b4a6a638bdb89b920d433b7ef539/78382270685.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732f1464742---51104505179.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/ramaxazimikutizuxisaj.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/17033937144.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/nubotadukifevusesetebe.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/95919701029.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160816caf4bec9---57065073667.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/bca5djjvjit9g5g8kjs73mp5gu/87255755034.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/61913059946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=what+is+the+function+of+the+pistil+of+a+flowerPDF 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_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 18224 bytes
SHA-256: 917e963ac346f5d12c4ba468c944562acf79f72c56bdf581428c2dfe5ac6e697
font_01_sfnt_off000110da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F1 10756 bytes
SHA-256: 3842e48c76d15402fc4edee2ae5116065c4e3938dde17149f5f8ff6399945aae