Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe31e71c98c7973…

MALICIOUS

PDF

93.7 KB Created: 2021-07-08 11:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: faf4ecf8c8fcde19a118d33f893e0836 SHA-1: 720e0c7122faf67f056e4d5d7ea881cfc9bf5957 SHA-256: 9fe31e71c98c797373c6bd0cfa5b19f5e0fccfe4da88ad3da42a83544cc04c5a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm hosted on compromised CMS uploads, with numerous links pointing to potentially malicious or unknown domains. The presence of multiple compromised upload paths suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/e5aff3555280cd163d8f926fe867db47/15683520155.pdf In PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/fopagemebubujotal.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/kogebuwomesan.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4e5b142c8---28301903032.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73795b2826---71847604058.pdfIn PDF document text
    • https://spacio.hk/attachment/file/86348355937.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1838d2b4fd99068b0851dcc710636263/90427731787.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d7d4f2c5d---76504198707.pdfIn PDF document text
    • https://shopabrang.com/images/files/60291155878.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/552c55ts3q13ol6g6krhgd291b/16288003367.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/gulatifilelade.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/64efj530n6f4059pt75vbucgr8/76468071894.pdfIn PDF document text
    • https://digireg.sk/upload/pizuvokajasaxojojin.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/lodosafekomeforipelivo.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/58662425775.pdfIn PDF document text
    • http://emeat.ru/var/files/13539405723.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075e42fb1319---garobaxezusamafi.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087984cbd1d6---18279805949.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c35bdd8a---maxivopifonetobokok.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4efa2ac32---rigebesajokomawozotaj.pdfIn PDF document text
    • http://ashioke.com/images/library/File/xanurodumubizuzudozura.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/4202070419.pdfIn PDF document text
    • http://fkhd.cz/data/img/golerebugomajufezir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=stars+coming+outPDF 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_off00010ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E4 17812 bytes
SHA-256: 899c113f343172ce35f8e5d6f59e92f860fbe3d571733a662c42339e053cc7a6
font_02_sfnt_off00015194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15194 10572 bytes
SHA-256: 1828eca40c4bf05f322dbc3009c3148e205713b1dc5f7b93e17af4fd91c65dc9

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