Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd01f0f17d5cd9f1…

MALICIOUS

PDF

93.6 KB Created: 2021-07-23 05:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e9376cb6147687e5e2934e4cc393fa50 SHA-1: a99802850016d8c1e6965bb8db12871cb1b2178e SHA-256: cd01f0f17d5cd9f1b8720576057ce26fc84e299a1c3baa033c4a41bf79fe4b1a
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised WordPress upload directories, suggesting it is used to distribute malicious content or phish users. The presence of external URIs and link farms indicates an attempt to redirect the user to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aimic.com/userfiles/file/38473321392.pdf In PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf30756e0---77136548847.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c91be6cfa58ebeaf5ad254c609a940ab/87987667527.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/612046c37e0bfd0aafc8352e5bbe38b7/lizuzunebig.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f811044c95---potuj.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/debmenmd7slbs42rrkj5lkqc85/mugikupubited.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/45048052086.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/lizesetuvusuvikoxuv.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608affd3cd240---figudogejujemefogote.pdfIn PDF document text
    • http://springbook.no/files/20469683229.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16071d448cad47---lazunejegosorevidit.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/jvd6oj98d2dgogbsila2gt5jrr/parifalixeselete.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/2ea010756dee3a5856881096de792332/pawetotejadolutev.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160746b3ca8a68---vetelonusasugifisu.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a72dd8b540d---vibenewigapusebos.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/q15vj6krberj76t3h82lceo1k0/7684608547.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c435f8a0f3---mumosukokovebenunowejet.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/9572129013.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/92641760204.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/b6d8f7f21a3c1baba2a48459cf3421f1/tifigataguxuritavenetus.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/rofokeridanaxemuzazivix.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1625883716.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/0igeqtea0vno221drklqdl9svm/56384965989.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/37n3elodi31o091mgp5v958el8/zixagekegoxa.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/rofatuwabedujuxes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=international+auto+shippersPDF 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_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12239 17576 bytes
SHA-256: 6f6133862230cf0e2ade25a2d04259ac10034a98368aefe9a751a2754ebe4775
font_02_sfnt_off00015058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15058 10400 bytes
SHA-256: 480eab06309d1b34a28dd33611517ac8cb75b336b9ee9265d9c13449e6217e17