Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39d2a10e0d68202…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 16:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e91200af4ef15f60906577be274fea1 SHA-1: 67a031ea78ff8b4c0bef68cb8f1e97fdc15842d2 SHA-256: f39d2a10e0d68202089ab0269c82cf5d0206798a91b369e1d37457f7f39ae88e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609de20fc32a8---rurosorun.pdf In PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/1df556997d96546ab6dfe996e82927f1/31661992079.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/pnsmk1vp1auq5v40e2mq8r20l0/87037248494.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/24555306353.pdfIn PDF document text
    • https://dannysacademy.com/ckfinder/userfiles/files/jimipagomitarajurajovasa.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210605_025820.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782e91eef6d---49242812406.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7961fd34277643000895ba28ccb8b618/98469550966.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/pegaku.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/pomupigetodobupis.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/p7u1696dgr2gb4atrvru55dr0u/negogosonadikanofafas.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210618_184408.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d3395d390---wopezeruzebataxepuv.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/56302077672.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/finefiset.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kk2gb96i7es6fjc51kmohpcqt6/41744311134.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607665da350af---72534720672.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/49342941000.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/todirujemupunobonubat.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/pajatiti.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ea6b70ab7310bba4afc8d2a754b39d2e/jomoruzaxeva.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78c23ee3e0---zibupaxiwodebugu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/9bd44b873f5ae0ffc6993ba95a2f9d40/83362771273.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/15484770089.pdfIn PDF document text
    • http://centromp.it/userfiles/files/42665485110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+hyperlink+worksheets+in+excel+2010PDF 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_off0000d80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80B 10988 bytes
SHA-256: 040b67aac4d6a66ca8c537bba645471cf18c72a72674682cdbbeb35d72f4b1b1
font_01_sfnt_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 16404 bytes
SHA-256: 427042e2646eb65e66bf08c7ab2a103a5eac7387a65609b246f2ccacccb5c625

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