Malicious PDF — malware analysis report

Static analysis result for SHA-256 533a07a790037663…

MALICIOUS

PDF

98.1 KB Created: 2021-07-30 04:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c47727896584f71fba87d0ab251a2eab SHA-1: 1f877a8500c3bae6078bdf99c5c9d33153da7f3b SHA-256: 533a07a790037663f3353aa14330ff87fceacb20bf51161970e7f3e3b718b18d
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised websites. The numerous external URIs suggest an attempt to redirect users to potentially harmful content, aligning with phishing or malware distribution tactics. The presence of multiple compromised CMS upload links further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://beerskiboot.com/img/upload/file/vamiginasemokonak.pdf In PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8a823cf5f---86092612830.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zeromolokezuvubukuduja.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948b50ca316---supebobenilisoxam.pdfIn PDF document text
    • http://amajyuku.com/files/files/56122633282.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/najavowuxobenerudiluwo.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/56257252644.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/legaravulozajomefopeka.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/9e8802d047eaee1e9a0ec4f7e663e72a/49033034143.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210603_C2E2346EE5F27376.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1d2ac832c---7028532379.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/53aa8dc51cbd7c8600778fbb3c2b9154/korabizimola.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/99620938054.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/volagabixisubo.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/pomizo.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/vuwusinofoponup.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091571d38dfb---28580234756.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764494ac21f---zasunafilunatepobeg.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/dcf150f4ca82f00d147e63c55945bab2/61843631672.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/4vrpeffcgquef2hams1eqvddvd/maxuloletowekanakexewojo.pdfIn PDF document text
    • http://fructusartis.com/i/File/58142841875.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/movimazijozelasas.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/99379238166.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/revikuv.pdfIn PDF document text
    • https://jss-moms.si/upload/File/novovivakapa.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f08e85473---50157050961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ilmi+kitab+khana+books+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_off00011ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E6 10712 bytes
SHA-256: 59187f30027043696b695c953c14da45934679488962bb2bcd37c55d2e0b27f1
font_02_sfnt_off00014d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D04 17020 bytes
SHA-256: 65bad942a083495cf8ae35afc082e9c26497c145cc4a77807396e1022d240c44

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