Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa493fdfbf5fa15…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 17:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 22bd7010bd72b9e0c1dc7932068c9d03 SHA-1: 59f986e65fb064f2ccd34b4bf822ac9058f2cff7 SHA-256: 5aa493fdfbf5fa15551d9b4381a041da46ff6ca737a85c6f5e4023225b2f4100
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various domains, many of which are hosted on disposable or compromised WordPress sites, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://newgatedesign.com/Images_upload/files/67769529239.pdf In PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/23503819290.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/bekosofafogixomogejatob.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/188944820861382741ce735.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/19868046268.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/72903090482.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b64398dcc1---jedapo.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/parimadule.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/pemexetevagalik.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/22453754111.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/77800103834.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/42280863704.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613349be32a46---ralupozopatozunoza.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/14880884112.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e6a184a65---84506470831.pdfIn PDF document text
    • http://juentai.com/userfiles/files/5127375570.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/55146292440.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/zakuvugudifusolakupopur.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/82632249097.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/tupuxako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gym+workout+apkPDF 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_off0000d217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD217 10300 bytes
SHA-256: f9a4690a0bbfee8a6bfd1f188d846c9c4d4bc49ffeb4c2b831186c788360bd50
font_01_sfnt_off0000e96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96B 17824 bytes
SHA-256: 45b5f184825b52dad724f12fbe2cdae559865bf8dca4a9ab8f443051ce178ad0
font_02_sfnt_off000117d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1