Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e19106d3f8ff7ef…

MALICIOUS

PDF

73.2 KB Created: 2021-09-08 11:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 134554295ace11d6fb1f399ad33002f1 SHA-1: 309a5e75ee085f9ca35cb03d3f1b273d4141ada6 SHA-256: 4e19106d3f8ff7efa8c56e10f2cbd706a168d41ad91b952b79cbd7afda8d9ef9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which appear to be compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of multiple links on disposable hosting and the use of compromised CMS uploads suggest an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ddb8ec2b1---gumevisuzidizupo.pdf In PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076bdc4243d3---45095319605.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/detofesafewakifiwifoja.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/35501045819.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/ed8adcb13fabc4bbe365b5878c34ba21/27082054142.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/sugifobijexaruli.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/polaxirenu.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/22743136680.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/tubajadopik.pdfIn PDF document text
    • http://www.pvvc.cz/files/xudekipi.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/doresixujubesafarimot.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d2cf7c2554a943a80dd52d456c2c80fb/wovatalidarepegat.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6840c53b23fe82df7822c4be98acf10d/depetufaxipopuz.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/64298204160.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16124ba8a3930b---30038188005.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c643d69eee8---10814162056.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/56648239089.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/75485041552.pdfIn PDF document text
    • https://anjingliar.com/contents//files/34909834973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cambridge+ict+starters+next+steps+stage+1+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_off0000b973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB973 11120 bytes
SHA-256: d3d04edc3ece98d922ef3fe43ab23ac441164ceebd925519ceea6c0085db6bd6
font_01_sfnt_off0000d309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD309 17508 bytes
SHA-256: 7daaeacccd4612a478b3d076231a3d1aa9ec5cff56b841f6894f2ae8263b9d57
font_02_sfnt_off0000ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1