Malicious PDF — malware analysis report

Static analysis result for SHA-256 04dafa2133adae3a…

MALICIOUS

PDF

90.9 KB Created: 2021-06-30 03:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 976a1e19062d2ea2c853eab3b9341d55 SHA-1: 44511a42f1f231e35b057909af3df5af5490a1b2 SHA-256: 04dafa2133adae3aceb7e954d81a201243b4f6e8e18bcc5fa6b6c244839507b2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. Heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. The embedded URLs suggest an attempt to lure users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb3dee4002---tanexaxoduwinazage.pdf In PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad95c0102cb---venizilifoposivir.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d72c65a92---goradajekerudizisif.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/54238413311.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd98f168b5---vadade.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/vepekizo.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f95238694b---88945676055.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/pewipotewupezaluximi.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d09fad0e538---zajuf.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/51491740947.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210615203203584.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608408a9d3d91---7444201249.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/kovizesim.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/81l0rsft6cp197hqbfjpkpur42/43988911385.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ff37b5d48---71238765217.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/2650634117.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/4jo5buerltck92ok8m21ahaa35/jovulag.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/274f4pem751935uukqgpai9ra4/53742553159.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d972e613d3---57625595312.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ovg6jma38fde56n59mrngtk8e0/62817912483.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8b3378c5f3b5ca4408fbdd6118001b51/vupusuw.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/42057565243.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/32779932284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=has+to+have+toPDF 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_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 32496 bytes
SHA-256: 8ab672582e541c9bbe277e98fc3ba98f0f732d085d3dff9294bd39570929db1e
font_02_sfnt_off00014765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14765 9920 bytes
SHA-256: b470732139b539f6ce4efbfac84a19f053cf5a22784322f7f963dd7862000b38

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