Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a027e14d6e08808…

MALICIOUS

PDF

83.4 KB Created: 2021-08-16 23:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d8e911ce2055223b26fcb9f0f5f8cad SHA-1: 6d56c4323a9c8233504aacc47613e102084d09ef SHA-256: 1a027e14d6e08808a61705873b6146d4a27886f255cdd087f0f8c5c60319b395
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous links pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the links and the detection indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1610b47e7845b4---96884287957.pdf In PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/joxemogu.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607de0dd66614---68998010455.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/timije.pdfIn PDF document text
    • https://airshow-bg.com/file/53812211942.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/b276d9858f2e410b1cf734fa3ffa1d93/widumuguwitisuxat.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/suwebupebisaluri.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/28524834200.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf81b6e759---kevanivunowibe.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afe8d0dae7---sulejaluzowimulu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607682d1b1de6---30093584886.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/96545346886.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/58881932020.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf178ab661---68886322080.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/bexado.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/salelukeguvekeniwajananaw.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/45162569947.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/2329644845.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/bozogekosuf.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/wewik.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210628002113992.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/jakopobop.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/lemidodurofifusojaso.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/65769042733.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f432497494---nabimuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+divorce+woman+in+islamPDF 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_off0000e2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DB 16456 bytes
SHA-256: ef80544f89620cd9a4c4a36d9de081c2fb3cbf470fb0ab68b09391afcac23f4d
font_01_sfnt_off00010da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA8 10672 bytes
SHA-256: 701a3cd77cfbee59d979f80408709af6bffcf7457db11c6b7a5283f08b5826fc
font_02_sfnt_off00012624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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