Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad803fc854eb6898…

MALICIOUS

PDF

102.4 KB Created: 2021-07-19 00:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 89b4a40171aa62e74219633e8d41d445 SHA-1: 7e72135c58ddb91166e04f5bfffbafea1be2c553 SHA-256: ad803fc854eb6898b4bc007d4f9c5ddf249d9f997e04f8de29ca2176869f5670
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The embedded URLs suggest an attempt to direct users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://phatgiaolongan.com/upload/ckupload/files/26567875759.pdf In PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16088f289dff29---11454786283.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/32449202290.pdfIn PDF document text
    • https://europartner2.pl/uploads/90317518703.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/jomojanabitaxefulu.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b9189102f---22304668651.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd774776743---faxar.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/o1neirna43cp7injgju5rdmni7/16433522069.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda9aad6185---72194433289.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/8795619233.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/2038978127.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/80321292677.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/zizamerade.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/17th9ll4sndqlrdn57fp2met1g/tobari.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/f661c29afcd56c89c1fb30697d2b8d25/nexawemirenugudisaf.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/lidawuzixul.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/47983596849.pdfIn PDF document text
    • http://axwelindia.com/uploads/xuzagibozur.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/fisivavuvuzifopi.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/978a90282ae6e260f3e095d998cd243e/33489252165.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc994ee2ff7---6019176206.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f448e2c59081248b91c3162fa2155c9e/39938326791.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/dixavaxanes.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/sojajogutanewizogumijeji.pdfIn PDF document text
    • https://tappowine.com/file/59924786540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=bluewater+50+catamaran+for+salePDF 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_off00012b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6D 18096 bytes
SHA-256: 4ece2d509309f5101ab89fe7b164a36b9fd8123ecbae05524651a2dd747b0587
font_01_sfnt_off00015ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB2 10900 bytes
SHA-256: 116a2fee8348f93bc933e275532c2e44c8af08a2494cc57018c3147dbcbbd217
font_02_sfnt_off00017420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1