Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f169db55a37a88…

MALICIOUS

PDF

89.0 KB Created: 2021-07-08 02:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7063a22d173b5fc1a64c56c4c57b6fe SHA-1: 3a02c991ea6abf276d8167a5079baeaaf7d95979 SHA-256: 10f169db55a37a88f53264b88ed9b25caa90843c3e55b90a9c4f9468376e339e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm used to redirect users. The presence of embedded URLs and the PDF structure point towards an attempt to exploit users by directing them to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/df06e206b3b68f52d28430aaed3d30aa/70645937554.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/f774f8a84852ddb17a7be5edb616bf01/sibepofejutifejaj.pdf
    • http://allasclub.com/campannas/file/mijuziturekopa.pdf
    • http://mujuerp.com/uploads/ckeditor/files/20210623204857.pdf
    • https://esvigo.com/upload/files/51924811061.pdf
    • http://edgecs.net/documents/26604501844.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada0a80eff---57334978520.pdf
    • https://xn--fct8ml6mwue.tw/uploads/files/56173943120.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097e83dcb023---kasoxumurakenuzudi.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f30ec8774a629d73f257240f34ee9603/dilaxojiz.pdf
    • http://nhhs78.org/clients/63854/File/86440564783.pdf
    • http://ebiocell.com/uploadfile/file///2021052323503845.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812af5410df---15249365171.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53006d2810---tavilunalawuroduminagili.pdf
    • http://angelcabrera.com/FCKfiles/file/26505752350.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d07b42435e6---93638745270.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c72658d301---98586860504.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/buzaf.pdf
    • http://sooclose.eu/upload/File/50435415598.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6faaa3514---25718034773.pdf
    • http://vce34.ru/attachments/file/35892828799.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608195b90e215---98106594984.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160829fe269bbb---pifefov.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d646466b4---xerezen.pdf
    • http://robwalker.net/fckupload/file/ziguwuwopuratitami.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+recover+photos+from+phone+after+factory+reset
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f670.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF670 16792 bytes
font_01_sfnt_off00010e87.bin
0d77af89d3c22983931426dc8d212e2e99d49443ae388f12222a9d8cd4af2691
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E87 10864 bytes
font_02_sfnt_off00012786.bin
9b7c4b4b9db0c674dd0fa0e2e0b5930d8a16e56e8430ebdf7e67c237b4954ad4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12786 17132 bytes