Malicious PDF — malware analysis report

Static analysis result for SHA-256 680446d9427fab03…

MALICIOUS

PDF

88.3 KB Created: 2021-06-25 23:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e05e213fb7925c64c3a52e253767c9d4 SHA-1: 0f588cd1b2419e7232e3426407cc60151a503035 SHA-256: 680446d9427fab0374410f85792d69aa0eed765fc66b1c4b1401d11c78677e68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan distribution attempt. It contains numerous links pointing to compromised WordPress sites and disposable hosting domains, designed to act as a link farm. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://smidgel.ru/uplcv?utm_term=interview+questions+and+answers+for+applicants PDF link annotation
    • https://mvpartners.be/images/uploadedimages/file/51470257761.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6be62769c4---61280915051.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a4de3c193---bilisapu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/loloremusakuja.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/43543356035.pdfIn PDF document text
    • http://alkanboya.com/files/file///22925658007.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c50aa10f7b---bagawagumetagabo.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609aade1d27f7---46583467193.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6cacc22f9---88230374511.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609d234ea655d---56416927362.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/88508102494.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40d8d098c9---tamafavanatadorexanus.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/tojut.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/juworamuvema.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/5495582165.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/xupovejitiked.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/sugudi.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/bff1bf959a61437a6c659a2ebe98ec99/75628399241.pdfIn PDF document text
    • http://gerocuki.hu/user/file/rapar.pdfIn PDF document text
    • https://magatek.com/documents/file/xuwemumetiwutitefaxaxiv.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d267dc0169---72496753966.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/42151524557.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/7c6bbe26829c670994c36c78a6845419/xewuv.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//758657430.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/4058f7845769d00fdfcf0fbf5d2d9bdd/33226404120.pdfIn PDF document text
    • https://avenue102.com/uploads/file/72744193247.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/gixawoxadivoder.pdfIn PDF document text
    • 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_off0000f616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF616 16924 bytes
SHA-256: 39a84c1fd98255efcbc2aa44ac1ca01587f5180d457e6c813ffe4b3fe4fb2997
font_01_sfnt_off00012202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12202 10964 bytes
SHA-256: 2ba4070808aa6a4d44e33af14116de892a97d3dbac11b082717f663589d375f9
font_02_sfnt_off00013b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1