Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be88512d394286a…

MALICIOUS

PDF

93.1 KB Created: 2021-09-03 10:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 469d24e92ac5fe1c7e85868046c3df32 SHA-1: d877d8a0a1d3b8143a8ea83569d69a15cc70b28c SHA-256: 0be88512d394286a405fb433595fbbc01b5689e7c94d99b703a7d169602e55ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that leverage embedded links to lead victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://asia-test.informacittadino.net/media/files/zododaruwokono.pdf In PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2ipefonh0rdvnvk9kk9ihnv0u1/tavokoteminubibub.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/redetogaderogonit.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/xejipenaxuwupepuf.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/20136065141.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/rajaguzisu.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/46760fe58cd4dc5c668c5f066cc75a2d/22357252741.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/vokuri.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/kogowuvod.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/93755966946.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd9322dec9f---13873556664.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9d156cd004eff8109e2fa4d4e640702e/burevolobikasusubizub.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/672b4d10ffef0dda2dcacea7b1e21829/gojepuwajenigaxitibuti.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/kotumowirodolijadisuwugu.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/48537231248.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/21359093215.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/lgc26m39biuh673f0rnu7720q0/24620767146.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/a1fb139b6db1f9540293aaf969920722/59075661263.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849b70db83f---fuwosejimumafopum.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/13118793531.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/60110520868.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/6977170969.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/46045858904.pdfIn PDF document text
    • http://lebo1977.com/clients/7/7f/7f96701a3ad848a090446b6ea7dc17b1/File/95866994330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=argumentative+essay+quiz+pdfPDF 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_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001203f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203F 11144 bytes
SHA-256: 50baf107fc900f8538d1792a0ffa855814461b926f98ae7dd9c1bf7494e0d9be
font_02_sfnt_off000139d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D2 17440 bytes
SHA-256: bcb4b16c78e8490f834ff3543009f83ef2803429855112c5b3e3c77603216cc0

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