Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c410457c81659c…

MALICIOUS

PDF

93.7 KB Created: 2021-07-06 10:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f4a30193274bf4005cc2a758a9caee0 SHA-1: cee61dc5f0d0214b8bf99c5edce72e2b78952c0d SHA-256: a1c410457c81659c4a7edf209aaf2cc45a54fcc5606e34eb4521a46e448e7b4c
124 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. ClamAV detection further confirms its malicious nature, classifying it as 'Pdf.Phishing.Trojan'. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2938

Heuristics 5

  • 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
  • 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://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/fdc1d4bd0b2ce21d5ef0d1da8238996c/lajut.pdf In PDF document text
    • https://muzeumkonstancina.pl/attachments/file/42268216564.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc96c2b3698---kamovuwagavujavefus.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/vidudajutisupofa.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ft547t7faipdfdrvsciaa3bl97/vipen.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/riwesoretopid.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/jegop.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aec9962bed3---80792795970.pdfIn PDF document text
    • https://soechi.id/userfiles/file/98148822454.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/munivosamezamuf.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/fijumilu.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/29955248894.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dec9d3227b8---70393059692.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ac4ec876c---9599458352.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b680b3449b4---94185548018.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/aa3807b9e0798c7a83d5600675bd8ff1/kofugeda.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/k5shqomf2p5g2p50mn0sgpqlk1/fufodu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/fd6cc014765e7669eb716ae96a9b3d56/21649401988.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105102337.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/2jfv16cor1jv010v2qk73mdsqg/javuberizafonomum.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607419d9733b3---duraz.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/73485186385.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ctcupmj6b03269jdv52kaekek3/patuzeretoranu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/oss3f61te6sl1kk4cs6d86juo7/16111503970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=deep+postoperative+wound+infection+after+carpal+tunnel+releasePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001315f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14976 10864 bytes
SHA-256: 5ec9e0720102249801315fc4be25dda032177e1b2c6525a9664fc71ad780f934