Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa94fa34ba76d2c…

MALICIOUS

PDF

111.1 KB Created: 2021-06-28 03:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd0ec1c1a3809c8be56277a5182e086f SHA-1: a0920533d961c078d8c995ab4578ea5a0b428bed SHA-256: faa94fa34ba76d2c149e65e563c27987905caadd3da7651502cba81cd24375fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to leverage these sites for hosting malicious content or for SEO poisoning. No scripts were extracted, but the presence of numerous external links and the PDF's structure point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/4kt00oq83erh4tc36gd3u1fjf7/22255877671.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/262e41066c428b8b40b3e812443e49ed/zajidelomogamokag.pdf
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/16326804531.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a523b4611cf---57880629719.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608939cb15a10---56880353120.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2b2312eee---damofubufemajafakova.pdf
    • http://yuanyoujie.vip/userfiles/file/12887795301.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/468117da3841f9307972421bb622b8e9/30679918886.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f372c4d55c---35673802306.pdf
    • http://yuanyoujie.vip/userfiles/file/tovufelirafukeluboza.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609950ce061d1---roruguzadiwelumidire.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/5be73ff298551892ce5a09f2d2ae2802/gitodefusalipebop.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c29fa87cc54---26127376304.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090e792e0bb6---4330150496.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/bb9b8e63a032ac8467d5b2aeb098064b/popejosozalatuwofemenex.pdf
    • http://colantuono.it/userfiles/files/tikipolegotakeguve.pdf
    • http://cbwmd.com/uploads/Files/34231219682.pdf
    • http://beveragesgs.com/userfiles/file/36093945248.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+monkey%27s+paw+discussion+questions+and+answers
    • 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_off00012e7e.bin
dbb81b44a781f40f92958943f1544bf1e6d9c1031e53cc2a27ef5cdda5b8d487
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7E 11268 bytes
font_01_sfnt_off000148b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x148B5 16792 bytes
font_02_sfnt_off000160c7.bin
fd7c477e0c3f98414292c61f7cac562373845275553fe4f4a9602c38dd9c8981
pdf-font-stream PDF embedded font (sfnt) at offset 0x160C7 34280 bytes