Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a0ea49c409d745…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 11:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9f752a5adfb23277fce248c375e8592b SHA-1: 4b48a1c8e9307b35110c514301668fd7ecb85a28 SHA-256: 95a0ea49c409d7455266f39dd24eb3caf9f9c6a852fe4199316d9b9e87dd68f6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL findings are sufficient to classify this as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://asu78.ru/userfiles/file/65223151403.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a8fbdaa6a0b7d405e1daf79eeeb467f8/vexolovano.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/04a117dbe2b635ae925ec2fb635dc328/67579272092.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8eodjt1kgks2tp5bmh7v1ofbo7/busute.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/puwumapemagedutubuxusoj.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/67787593187.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cc18d8311b6---78502322602.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/15014280785.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/20124568574.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/pijizemalikofuxepawemad.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/699ikjudd7sn5n0rhe4ad73ode/59288285468.pdfIn PDF document text
    • http://artepcb.com/upload/files/sifefowopo.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/4029d3972c8c775cf52d25e4ec03d3d1/38152860395.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/90758097391.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/2854cff3b6ea222f697aee533f1efdc8/rubedijubanogozawuj.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161087ab62920e---49164001467.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/25497500015.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/u16j93jcretv6ak20hle9bolq2/xalikojikirarutalutoniju.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-8-3/20210803183900912385.pdfIn PDF document text
    • http://poiskvod.ru/images/file/77756192228.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160735362edc27---69721409661.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/10143710148.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/mojeneratud.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/lalazebesanifu.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104b48761bca---85528469278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=live+in+the+end+neville+goddardPDF 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_off0000e696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAD 10380 bytes
SHA-256: ef4b8b98a935f45b4ea6ff12997df82d775566308085d198ca100530eaad82ad
font_02_sfnt_off000115d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D9 15524 bytes
SHA-256: deac08e6a7eb1f10b3e036971042a5141b07151c78861b51c6d2f75e896c6f8b

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