Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b46390b94c11c37…

MALICIOUS

PDF

97.2 KB Created: 2021-08-12 16:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3458906a7a02cb85ea4a8c1afe06d56d SHA-1: 81541f015c943dbab68a9b38bf50efe27afe22ef SHA-256: 5b46390b94c11c371fdb82de615560b01a8259f193bc348750978da46a18476d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://philabc.ru/uplcv?utm_term=how+to+order+bolts+and+nuts PDF link annotation
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed62a0995d---14055150030.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dunexozejadiwirexuvonaves.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3j63s25bec61lqj8puigjqpcf2/sukanatijizuvesujeda.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc3677cfc---39561193219.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc5df5bc9c---nomor.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/64880516152.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/9998154141.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/a45d79ac7e0c7b7eb9952d1d1d080ed3/30755583460.pdfIn PDF document text
    • https://grandmake.com/userfiles/tikilesutevanexug.pdfIn PDF document text
    • https://nevisnews.com/userfiles/53250811219.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/lagezuselapatipaw.pdfIn PDF document text
    • http://merwepizza.com/upload/file/vasemunotobozefi.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/d5a1829o618ms06sm8916fo3nc/99016985095.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6350b27e44---49311501548.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/88476183958.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/takifem.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e3a03ce09c864717e01716e905842102/nosowitatadosa.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/lijemavenupomubikiwamowib.pdfIn PDF document text
    • https://teddybestore.it/file/88622046957.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/rajaxabebimotujigel.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/85211775284.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/duravokexupanil.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/pulolirikuv.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/pupexexibituzisolobo.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/41254199158.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_off0001182c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13043 10464 bytes
SHA-256: 95dfa9a69c4d1f33050c64e21edc11c62847f014c25ed34a4fcdc473e2854809
font_02_sfnt_off00014827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14827 17680 bytes
SHA-256: 7ef514d072583346f9b5ab8b76898d72f2b58f38c318b625ed94ab16ec8668bb

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