Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d97a23eed60194…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 14:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a93297bd5b962d4ed2b7ba5386ea968 SHA-1: 7735dcb0e918474086c2696be40bcd9c1092a310 SHA-256: 06d97a23eed60194a9f158abe8cca394b8003b69e9362269b0f3610e50dc340d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links strongly implies a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://alfonsoguiggiarchitetto.it/userfiles/files/borafuwuwib.pdf In PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/dc7m8m59iidguvme16j399o6cm/84273575899.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/65033349297.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/65719853560.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/98168289691.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/12783437321.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/qd4kk0ll649h9hcbujo4hqkmce/89091198229.pdfIn PDF document text
    • https://adikkedua.com/contents/files/31177805931.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/wifogisila.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/66777031997.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/lotovabal.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/75349295699.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134837082bca---42636373038.pdfIn PDF document text
    • http://ifap.it/images/file/maxowewaberuluvibeseb.pdfIn PDF document text
    • http://midospa.com/upload/files/30105686523.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a51474e2278531f7d151266e4ef75efb/66258710867.pdfIn PDF document text
    • http://mgrima.com/files/file/79435492545.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/73082439840.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/6471794094.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d99c70bf81---78736824326.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/bugejaboto.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/87344749404.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/30124609949.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/jezowokamem.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/89880845045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+do+you+send+pictures+from+iphone+to+androidPDF 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_off0000b159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC970 11132 bytes
SHA-256: 1db7f4cab6bce5a4a0d74c3d64f6c153b8e2073270d244924ce13a04020d99e5
font_02_sfnt_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 16524 bytes
SHA-256: e71bc71723213f6cf0b57b7867daa9fada0c0e2bdcdd8f08687ce48423502a64