Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7b0e83744a1bb4…

MALICIOUS

PDF

86.0 KB Created: 2021-07-01 10:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45075c4662aadefc00af24f8c22d8057 SHA-1: a55f9a49b9bf1e54bc0b9bc4edfeac2cea67d0ce SHA-256: fb7b0e83744a1bb42b9545050e3b8440f16a3a0a84212a28824c246cbff0516b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, forming a link farm. This suggests the document is designed to redirect users to potentially harmful content or phishing sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://goteneplast.se/files/images/file/sigiritizasobobumimok.pdf In PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bddf4ea1010---57880698412.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xiwujulonizonudesebuw.pdfIn PDF document text
    • https://btegypt.comfile/numozokunotaribefaxu.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ca4922d3c---64530675370.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/tewoxasodosofufifefamu.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c8f5fff00c886db288e678a5dbfaa092/98230552983.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a19b6b8125---nariduliwifotepepikixuzu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdd124ba75---69939677690.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/35724486835.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071dd4251fcf---95394249593.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/id4hkoj2te2vtl0vspuep8fit4/41077692504.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160713c36b8a0d---gerofuto.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/94eb27fc58d9c30903f27751752fcbd2/42301323144.pdfIn PDF document text
    • http://cosyromania.com/media/file/50528299026.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/dnpqch1isrv16fc4crdamujbt2/22710088646.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/91337698887.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/26027189002.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/3of1h6rmhg7d3nu1ua4jrkhash/49884481418.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/samaxikijabupebikinawot.pdfIn PDF document text
    • https://securitydm.com/slicice/file/fibato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=class+11+chapter+sequence+and+seriesPDF 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_off0000ebd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 10820 bytes
SHA-256: d43b2280aea4a45ff53f49ec2f24bc939ed491461037a4f3bead2ce079feb391
font_01_sfnt_off0001048a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048A 17584 bytes
SHA-256: 9ee53d3f0d50257f62302c342b1dd3381f02fc1b21e32ed595f354b23f43afa0
font_02_sfnt_off00013303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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