Malicious PDF — malware analysis report

Static analysis result for SHA-256 b443fa6c582109d7…

MALICIOUS

PDF

74.2 KB Created: 2021-09-20 05:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b058ecc6275af6b4091d9a4395f6ffca SHA-1: 337a013523c4eb13de1da49e31e37fd6bf55d933 SHA-256: b443fa6c582109d7b34bed48ae4429bb473adcb8143d9e8d0cb58265aaabd929
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains identified as compromised CMS uploads or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://3qbuy.com/CKEdit/upload/files/71176610687.pdf In PDF document text
    • http://jumpstart.mobi/userfiles/file/71189479755.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/jowifudiberapakapew.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/84093447441.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea8ecb94d---sebirogisupel.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-16/20210916025432392620.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/83020678686.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/291181467.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/66306515819.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/34821372033.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/92474973791.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/zejezatulemipen.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/54970345287.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/19363250599.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/demizekonedoferovili.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/0d075d590f09e8e5cca6164e7d16196a/66942662396.pdfIn PDF document text
    • http://p-energo.ru/content/file/87000382945.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/lepupaz.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/93520432647.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/tolowix.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/39980342590.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/27788969144.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/detadavege.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/fuhdi8925eb7kndsrprfctt8a9/wevuzimimowagug.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/5762389934.pdfIn PDF document text
    • https://phr4u.com/files/36450441509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=free+apps+to+watch+movies+on+iphonePDF 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_off0000be36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64D 10720 bytes
SHA-256: 3651ea3bb8ff72f917273db21d4819bc77f2fa16a35b75a666f29f2585e8c1f1
font_02_sfnt_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 16672 bytes
SHA-256: f19718d7a79d1dce4da7c0806a6fe43631e5789613960d528f686605ade19184

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