Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c54b30892c2000…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 23:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5884e11cf59bcfa5e419bf571ffc2bb9 SHA-1: ebd88c2d1d3ea9a450c063ef5c152b192f7aae03 SHA-256: e7c54b30892c20004b13405d573eefd06f685842d21143c8ab6270fbff60d7d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious or phishing content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, with no clear user-facing text, reinforcing the likelihood of a malicious intent disguised within the document structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://catamma.ru/uplcv?utm_term=number+7+worksheet+for+kinder PDF link annotation
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8b48b17be---bevekegigemifaso.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/dc6jcp32en2s384tj243d8mcrd/bikodopewob.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/gerarijowovukuk.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9014e26362---52871214925.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/f688c3893ff5935141d199eca64e6c2f/37242783506.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808023934ae---jamon.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/sasimafupabupimu.pdfIn PDF document text
    • https://mediaskills.rs//files/sarabivijazaxenusufo.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddb4a4e2f5---jupifojosixe.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/72699857559.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210721_6F673CE5D3372AEC.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/99546106798.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/xuzepegopalobosivin.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/63056d7f137fbaf176536635f5ec0ec9/wuniwukarawi.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/sujox.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4f8db1795---6240042070.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/lejisijusadapijufenarise.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39cb366387---dotak.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/26915740298.pdfIn PDF document text
    • https://proia.bg/userfiles/file/sagiresagilekike.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/87130726382.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_off0000dab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB2 17760 bytes
SHA-256: 60db64cae783404f11ac62a557260e7112aac1dbc5e8775787e35d277a8efeed
font_01_sfnt_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12069 10856 bytes
SHA-256: ad2ef842e5c0d4f9649736c11f4693c5f28880215045adc79b57bb97c717c582

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