Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c10326e4efa6c9e…

MALICIOUS

PDF

81.7 KB Created: 2021-08-16 17:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7cf0196d375a15cd12a1e2e4d5d583b4 SHA-1: a7cf50905b60ea15425c1044fc89a48c454676a4 SHA-256: 7c10326e4efa6c9ed4672a24f4ea27354de360427645da4a3c628974e70c7808
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially malicious websites. Heuristics indicate these links are hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://synerhu.ru/uplcv?utm_term=esl+there+is+there+are+worksheet+pdf PDF link annotation
    • http://ledson.ru/upload_picture/50794321263.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/dotalomugobewekajewiral.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ed8da7e4c46525072418c302c6116638/sepegew.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/malulimekogalilute.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/vd366hsj4opf6onp9nr2u63ar2/xazodezak.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/xudovot.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/jajekixekopa.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/sivafin.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/64413410088.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/kekopif.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/38550159125.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/rapexon.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f119950eea---26570323807.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/60717421515.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/zapiterofilagufatij.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/qshu6q7e761d5cb5nt2n8sc8uv/varubarejogoboronigasale.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/zogatenenunobusuwefut.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/78055243385.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/04d34248a434fb947c5de628fd03b02a/gokogujidumigimeki.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/jukezod.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/73786396828.pdfIn PDF document text
    • http://turnyras.lt/Files/file/vitufebisijon.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/jukefobovadifik.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/3daacc978b8b28354cee92e4bcd12669/lagotevonukewug.pdfIn PDF document text
    • 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_off0000db19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB19 10652 bytes
SHA-256: f338b4f694efa02299e6bb3072cebb81edc8b011f974c0bceba25040bf1793a4
font_01_sfnt_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 16736 bytes
SHA-256: 1014bb858b10f7ba10822ca102dded756102f6f0150c023255eeabdae63eea3a
font_02_sfnt_off00011ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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