Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce7f07dfa2fc2073…

MALICIOUS

PDF

94.6 KB Created: 2021-06-27 01:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 07edef527f9b7ae02841913d7a6490a6 SHA-1: 162a6f50dd9777f1e4c073d2ed5feabb3882f819 SHA-256: ce7f07dfa2fc2073f040d58b81e7c3eab55b8097af38e3778d2473ed5b8de15e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple links to compromised CMS upload storage suggests an attempt to disguise malicious downloads as legitimate files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bcc54ef71---71537848689.pdf In PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/0fb6b245566cc282f396b1793d1dd0b9/rifixigu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8008f061b---vizagevukuw.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/149mb7aamdrl6h5bf2kbdf5ks3/82658876305.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/zagapusegugubek.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f00c0c2b89---gotilikujidofajenix.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/78852731712.pdfIn PDF document text
    • https://zop.bg/webroot/img/content/files/16327726924.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eacdd67012---22669090720.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/lugalikeb.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/fofovufofidik.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/603a1b68b43bca6413dd4a59ee9f8972/72845500262.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ec1a742ff---57837671129.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/84534331431.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb3623e6bf---7927894419.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/574d21018eb46996e69ad37ce9410abc/5869133212.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/pjilvam2v5iuh9gknpkn053g67/kodiwude.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc36e5526f---mitajozefegilagozuwinagan.pdfIn PDF document text
    • https://buka.ru/sadm_files/penekuberoratokowu.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/199c5302ab9a89c9b8cf9433ffcd45ca/lareruxutedapowozatif.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/09482a87389ca6390913625c59e17db2/25489798827.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/927e5c19d91eab8d9eac1d99121ce183/pitemarola.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb48882783---jodepujemu.pdfIn PDF document text
    • http://juentai.com/userfiles/files/35834081639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+mirror+image+a+pdfPDF 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_off00010e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12679 10600 bytes
SHA-256: cd061e80db5c6994e802eca896d170182d3e5e77bd0e9cc0bbbce31a21cfcb6b
font_02_sfnt_off00013e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7A 17700 bytes
SHA-256: 6f15e93f9ffa7be2356f3564c7c83cdd44972bbb5e93813827f9f2334427587c

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