Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7fd7a50f78a802…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 20:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5fc647df826b4d15f516f850f76dcc17 SHA-1: 01f007b85b9e8b9c42a5007e8774c40e66c6761c SHA-256: 9f7fd7a50f78a8024fa640bc84d5f95e2ec5b5559b0ea0233b59dfc76f274f2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to numerous URLs, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7cf7e394ee98af41b2a495544cfe7c8b/18542404633.pdf In PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161070f68beb95---kezumomaduzagudogavifazab.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/56075467788.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/53797833396.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/gh50t9bid57k87gmf75me8e5l0/sigugudorimiligozeluz.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b20f72700---46911391618.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/85101387110.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/16481629562.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a15c6e86e---luwuwev.pdfIn PDF document text
    • http://happy-land.hu/editor_up/fivomuxotuzeforuvero.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940c8b5ec16---bivigaxudoxajaz.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868e98ccd8b---vifabisozopipef.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7f9454a90---jedipirikusifelo.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/vuzine.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/64315751482.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/xitalepuka.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/91553210039.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b06c27650b8---koganeluwefoputasazuni.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/f967731bed66d0db44979d74819de80f/31118186980.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/6c61c8d716d38e2c45db0ff3810cbb2c/vawexugepuba.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/85002165396.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/60a2d7925cde74e7ca42fd7908cfb24d/76797604117.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7d034e3385a0c1b92f7236aa87f00b89/67387386339.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/72172643041.pdfIn PDF document text
    • http://naucseto.cz/storage/vedatisowomezokasejaxi.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/rekemalaso.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae27eb24f28---91852111091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=all+name+reactions+in+organic+chemistry+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_off0000e069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE069 11164 bytes
SHA-256: e487fc0626dc274adff43ede07e681aa301ca4c61d2888703095f88da75a952f
font_01_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 18564 bytes
SHA-256: 8b2bfaa2d18bee9a5aa25d8bcdc628292e1b91533fe8a5bb4e42168511080739
font_02_sfnt_off000129ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1