Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b820357741ecff7…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 18:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 92bcebd02ba59ed254ab6f1394b2a298 SHA-1: 7cf1c682c867fb0d60c347c9500747013272cab8 SHA-256: 2b820357741ecff798d234fb317b44d5c5ac650ca81d509a0021b5e02489c724
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of numerous unknown URLs suggests a broad attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9dcb9e60---zupojelosilifepesig.pdf In PDF document text
    • http://alltechsro.cz/files/43397046919.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/jufafumexididosixi.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/28489777952.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/nuxusepi.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f70df13b23e0b49fbbfb1c88d3e0eae5/64205066788.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/95882193833.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/21018094327.pdfIn PDF document text
    • https://irrisyst.eu/files/file/28708728473.pdfIn PDF document text
    • https://ckmandarin.com/uploads/56711395953.pdfIn PDF document text
    • http://cortabellanews.com/userimages/pekagapanejipuzobabipok.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/26hs6qf78d34u2q7bsdv6re7i0/fizapejazivesav.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/xexunoburujitudetarogawu.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080fbd272642---65443239298.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/1bef6513295e6eabe031d4ac3e094158/56556142620.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/66753814674.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da2aaca20e---vimunagip.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5160765c8---fusigok.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16251365261807910234.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210817092643.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/41400056084.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708f30e0433---niriwogik.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b25ef9609e9---44003607581.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/58956086454.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/zolujezogivekemanosijeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=tonsil+removal+processPDF 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_off0000ecaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAA 16508 bytes
SHA-256: 206bfb7a7d6d283687cda7008afe9c4aa795c758f58557202adf1d4fd6945833
font_01_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4C 10464 bytes
SHA-256: f74d31a71208f750b2eb0af9948e76aae7ffd48296ee18ccabcc8e9b3eae428b

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