Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceff18761d973503…

MALICIOUS

PDF

81.4 KB Created: 2021-07-07 22:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3d75c30255aef34eb21e7f8d7127e2e3 SHA-1: cbb9a40b05dc04f0c361dfe93a19bbbb89f4612d SHA-256: ceff18761d97350318f33622c1e1d68de9799aab44e846a25a5ef7645c0fe9e4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://thekitchendesignstudio.org/uploads/files/90508590268.pdf In PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088948f1c778---5711027763.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/684c861eab7000c85aa79486385b2008/zixezamuzexozudino.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/98680648711.pdfIn PDF document text
    • https://bselink.com/userfiles/file/37484825598.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/1o7uiapu86p2kjn8h76iceqfbc/66920116466.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/7bafc88d08e0150a9bf1f60cba27f547/giragatixujivij.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/detalelolojana.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/bb947f7629ed4e240e10f3e9afa79733/rigapusevagu.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210520014526156.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/49195862475.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/nowanagezigeridelo.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/jleq7t2d2a0flb52v3f8aiktr2/wezomapu.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/87843141353.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/d6ksole794bek3bvgeaa8tej87/dovuxosem.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/50285414953.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d20a41d0---defizul.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/c88f847006c7ea526ff46d7752098b36/jenobamawipekusipijimir.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/19170285196.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098318840683---rogevemujokutatidamuket.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1d57593af---50330148393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=use+the+discriminant+to+determine+the+nature+of+the+rootsPDF 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_off0000d7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B6 18068 bytes
SHA-256: 3b1cdc0657e6b9e36114cd1e29e98e248962c89090db2c74729a4b97c649bc58
font_01_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F33 10800 bytes
SHA-256: 31ff5018bf873555575115fd506a09f2cefb896e4bd1f7e33d02065bb6987709

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