Malicious PDF — malware analysis report

Static analysis result for SHA-256 56aa9fc3d8c7b388…

MALICIOUS

PDF

134.6 KB Created: 2021-07-19 13:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1834e80cdf10ac407178de3505c6f015 SHA-1: de65bc56f92a7df6c7e19ea3a731ac1191a5e312 SHA-256: 56aa9fc3d8c7b388915200061a3c062d2a9291a9f634def14ff2e26943dea910
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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://cn-biyoute.com/d/files/tusapusifegupozu.pdf In PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090f592b038a---poburud.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/sovajaloriforera.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/8b2282321f4d7b5632ebb374e46ace3f/zivub.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/fhqn2cd776i0tsvjoa9pc1upjj/25897758793.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/3551352640.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210608234306606.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/fdedbda9093de2af9d7e30eaeaea4437/9177004236.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/95656768238.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/dd30b9e96cd213fe639d83033a71492f/53479948894.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/6lh8d9lsc3gvht298im6nq15tu/6172519042.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/7p14evnpjm6ac25cdjcb4ordp4/vekon.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b0df86e22---puwokefetuzuna.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/masuzenuzukajiduwuxuzolet.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f48c26c96---75566946651.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/bc03e6227e666fd85bd02a9ad16bcd98/32438469101.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/kigukutekuduka.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160816f9b2f00e---didedalosejibapiw.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3edb536d7---75732883628.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c969592914c---gejubexojabagixasivonusam.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/25425758508.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/9851158632.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/fogomodu.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/bikeginamuxurazipagur.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/puzunowomotadakefaxevika.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/bedojizif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=elric+of+melnibone+witcherPDF 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_off0001ab28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C33F 10480 bytes
SHA-256: 37bb1678b6bf6d846e5e491a57d8f012baffc0fbb9a90676f8745783162136bd
font_02_sfnt_off0001dad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAD6 18824 bytes
SHA-256: 5373b7a89cf6f7ee6123a293d7b632af295cf00a9baf17683f90c90d9053a111