Malicious PDF — malware analysis report

Static analysis result for SHA-256 f310a3210e6ca530…

MALICIOUS

PDF

78.8 KB Created: 2021-09-13 18:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f0c971e8d87e4404d542d75eea021c3 SHA-1: 878045402d5eba1413f50a5b0c0eac9ca3621c03 SHA-256: f310a3210e6ca530494ae59dbb297e30e8267ed06e90b0bbb8eee57f2e20993a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are identified as potentially compromised or disposable hosting. The presence of multiple links to such sites suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://tailormade-sales-marketing.com/userfiles/file/33539930178.pdf In PDF document text
    • http://apartmany.cucoriedka.sk/data/files/25258690704.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/50852304215.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/zebizu.pdfIn PDF document text
    • http://iphysiology.ru/upload/71206594954.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/wetitutoranupakomo.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613081845a430---25592419366.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/bf5d946a543c5d275e31e46ca5cba1b5/werugum.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/98005073008.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/13566037623.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/29118273414.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/luziluxo.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/44772268145.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a6d8ff57ca3d77d21be30f7172268b79/40055381487.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210910_7D77B59BA7753C6D.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/77580569030.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/pafujoxometavubonuteteve.pdfIn PDF document text
    • https://artenika.pl/fck/file/sururivapaf.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/40651528360.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/wozobotitirapuxazemisef.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/53644216249.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/ludorefekaguzaf.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/1594753752.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/bufikenebat.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/35361194234.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/nasesixakagukologijukuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=toefl+reading+comprehension+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
font_00_sfnt_off0000ce0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0B 17724 bytes
SHA-256: 87cca4fa695ca953c91a052ef4f97248b2b27fac4a28021b840d44219faa5cfb
font_01_sfnt_off0000fc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001149c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149C 10932 bytes
SHA-256: d6f699f0ceb56952abcd4e9c63a80754e5d6fbac21b68137aaf95329b47b6fe3

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