Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2398fbcaf295b9c…

MALICIOUS

PDF

81.7 KB Created: 2021-08-13 20:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f8ae340db3f7688ba13273349978d13 SHA-1: 634ea7bcd663cd60d919802d73ba05afa1a9b2df SHA-256: a2398fbcaf295b9c38b9c1310c3024ce7c4c42773bd4f3c7fba4623381aab269
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests an attempt to leverage these to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8943

Heuristics 5

  • 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
  • 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://aylincinarli.com/fckfiles/file/24794117204.pdf In PDF document text
    • http://hanboo.cn/Uploads/file/2021072107054670554.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b42a4815470---wevomezopexedolov.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/zinesi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160e92308f37e7---35093435350.pdfIn PDF document text
    • http://primaneighbors.com/userimages/pedazuxigamibugusumiso.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160782e75d527d---26849891112.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/kutoratabe.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/eee7f252196f6e388c40c426b9a94332/welojivigeli.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcd4893cb0---sazatilanigeb.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aec675682f0---73105597594.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/361c34d184ba1109d51154f978459f51/6531070254.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/b9f9b5d20a974fd45d2f7c27584c6f0c/xeturanixonakirinazuroju.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a577601e8---44958922510.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160829aab2254e---lanexi.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/deleviwipepemalelajojoku.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd77f4965b---digugadedujivewima.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210702073430.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/49319399207.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/2e05458159a122f0f12e972372a935b3/87097553346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=list+of+preposition+words+with+hindi+meaningPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 10944 bytes
SHA-256: 58d8bec0ab9eeb5784bbd2ffe82455e70f52bf92e8ffb2a08e33fe5d04025c1f
font_01_sfnt_off0001126d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126D 16956 bytes
SHA-256: 9c81163f4d3ec38afc9892c78d82ec07fc7db68734c066f40d788de67c2c9bd6

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