Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d46f82402c49ce…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 23:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0870046f379b73d595f0f7821ef5b440 SHA-1: 49950281894c9d2ff2ac21ff80e1157080d6302c SHA-256: b0d46f82402c49ce0a32993588cd3601cc1f5dba3a2492c44a323786cb76f830
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a phishing or content-luring campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348616444f7---15246527465.pdf In PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/15743504481.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631402398.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/nhvulcnba9mu30e0pqoh203ahf/pamotovuxixalafaxepi.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/kuviteguru.pdfIn PDF document text
    • http://huefpdf.org/upload/file/20338810812.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/folepiderenod.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f06ac306a3---nufuxagusagixu.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/46085977321.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210911_185846.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/62345994086.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/99891266118.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/vudigegavufusabin.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/77706472253.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/84021454825.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/76887985992.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/75194477066.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/86570421380.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/losopedavonimelisiko.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/gemuzewunezivazinuwatine.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec1fd040ff---zasixogalukovepomixen.pdfIn PDF document text
    • http://markone-tools.com/upload/files/pirubogenewij.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/62172492458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+change+a+voicemail+on+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_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 17644 bytes
SHA-256: 0133364e8689cb4411282a7dc4571721e7f43976d09c8bb10b3f484a1dd9ad61
font_02_sfnt_off00011d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1C 10792 bytes
SHA-256: 320f346791f6f996ad8ab4376834ac09101b19e29ca0a37591f5ea022097dfd5

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