Malicious PDF — malware analysis report

Static analysis result for SHA-256 8701fd21c05aa37d…

MALICIOUS

PDF

94.6 KB Created: 2021-07-25 19:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e48c7353b1fb517e0ff11c54a2f6a621 SHA-1: fa4c1ed9e47a3e6a5f5ce2581ed0b00f548b1d46 SHA-256: 8701fd21c05aa37d85e75185ec00ca0b05e4287db52ef9ed9eb9f48b0d760c67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised CMS upload directories, suggesting it's used to distribute further malicious content or phish users. The presence of numerous distinct hosts and URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf6529e2e0---walijoromepif.pdf In PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/8db7a2f33d86557ecfc3dde66ece111c/39916670454.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b70b1c4806e---62617549100.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/ii1agg218mktbq61rdurggd356qs2dl7/41405999218.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/27517d3aebc2239a82c4f854bf6af205/55932316496.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/jaxazuta.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/115659e72a908fabe244e95ea887aaf6/piluzivomu.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f42492b8b2d---91365956602.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f209944eb---26515811459.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/c3f53l8n8knin4k4ssi3ktpij4/lumomebowetopipexo.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af6e2c327f0---51239447061.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e483ad7bbb---78662674265.pdfIn PDF document text
    • https://majubesar.net/contents//files/37022349950.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/1i5g231b44vttfl807geml7o4j/guzudeguvuxu.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc79f7026f---natomovixefow.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/b2b3548cea5d73f3d3ca817ae1883aed/vagarumikujedep.pdfIn PDF document text
    • http://yuha.be/_files/file/63105651540.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c9087fb366b29178a980a6af415213a9/figodumoxo.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a7a5b491f---derefubu.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/18698753035.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/gifiwowumukixokofes.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/4ca3b92ef71276df47beebf8530de5b9/zoresaluf.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2f4f06877---52665601992.pdfIn PDF document text
    • http://surtek.biz/image/files/20150119_012945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=zikirli+ilahi+indir+durPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF591 19612 bytes
SHA-256: 166096be9eec211d7361667e47bb196faa046f7032ac99c44c45a018c9b0aacd
font_01_sfnt_off000125dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DC 16380 bytes
SHA-256: 677e9695f62afeefa27de66f2ae2c7cbd721294f5310bfc85fc12255cd4c105a
font_02_sfnt_off00013c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C10 9984 bytes
SHA-256: cdaca5b229a4f95f1decc896a880b19dbed90452eccacfc92f339a0f9cc5cc51
font_03_sfnt_off000151fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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