Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b71d2de0ad3edd…

MALICIOUS

PDF

74.5 KB Created: 2021-09-27 05:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ce809bd7ba681fbdaec9f462d68b5fe3 SHA-1: 1d62e7f8aa9a441b133e03450fa4eb697159a25c SHA-256: 97b71d2de0ad3edd240e386068e8bb954bf08b9c8fdea20b1e4da34c31db938a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/nedalorodaxenogupojok.pdf In PDF document text
    • http://preiss.at/upload_files/files/rupakober.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161479c83deae6---2085841399.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/lomukevorewiluseso.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/78470714236.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb0e99eee8---93420103385.pdfIn PDF document text
    • http://laguna.piyawatgroup.com/images/files/mopodipinuvaparijema.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/sipenudozivuzot.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/76933981847.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/93800114896.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/22122649051.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210909082115_vxfk5l.pdfIn PDF document text
    • https://10fci.org/userfiles/file/bumisegometowozozu.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430466a93d0---94701906074.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/jemuwofesobipuri.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/32864702506.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/kalarulo.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/54388638899.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/jelasutokabeba.pdfIn PDF document text
    • http://envigest.cz/upload/file/dotatijunivereluzi.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/32967321525.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/guvavedu.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/97372251721.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/87072404913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=chrome+os+vs+android+x86PDF 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_off0000be84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE84 17188 bytes
SHA-256: 1df4dc36a1470200bb644bfe150505496451fa908e6de9f711d8ed7f0d4695fc
font_01_sfnt_off0000eaf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF2 10944 bytes
SHA-256: e79c9b376bbc513fed9576d5497cf73e1ce109e4a6e39d2841fe7e6d4a13eec8
font_02_sfnt_off0001042f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1