Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f18ac6cb269adce…

MALICIOUS

PDF

87.7 KB Created: 2021-09-03 02:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c3e466e61b49ff1d8961fbdf1be553a5 SHA-1: 1bdecc4337ac29a5b96dd8b6369279bc3d94c187 SHA-256: 7f18ac6cb269adceb94886848af4eac2acc9a453449b8f29b83a29429fe1a350
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS platforms and disposable domains. These links are likely designed to lure users into downloading further malware or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://stellar.ru/ckfinder/userfiles/files/89279911496.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/1eb441380759483b21861f5a359e263f/risadulatibamedojig.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608954f68656f---kipuvexijuvenawaxuzebe.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/8798faaffcb42d8208bd82c7ba7f246a/bokekudirevokitura.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/30d9e084354b3abdeb875bb8232a941d/8591648820.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/dugugu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/8fe012abf0aea864a85f8d23b5926a8a/xamunufama.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/taxatekujodifafis.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021828746125941.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/30275281451.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e7d93f3e4f---gurazowatufawo.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/vakid.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cbc6500f8---wanikuv.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/ed35815e51019bc66c51e8356c2bffff/8134979703.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/91070640945.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac06e79927---3545329154.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/14747333575.pdfIn PDF document text
    • https://lecachet.fr/docs/files/wimix.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/1t5s27k53t22t9aur6gh9cbapf/65313080371.pdfIn PDF document text
    • http://lobi.md/userfiles/file/fiwafeborubozutidijaroxiw.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38cba753d8---ximutefugefebijodoner.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=easy+beginner+guitar+songs+pdfPDF 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
stream_003_off0000f127.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF127 18332 bytes
SHA-256: 8c37e5e59c30033f106f294e4b44466a80e605362c98e91df8504bee76512731
font_01_sfnt_off00012026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001383d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383D 10964 bytes
SHA-256: 95a058c6d7f2431771313558e4331cc5fe3a6068f621828d48b15d6f2e35d046

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