Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5132c76fd69ac8…

MALICIOUS

PDF

76.2 KB Created: 2021-06-25 05:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1af0da983e3b0cc92d01c83f7e1cb513 SHA-1: 37f0a373ac0f892198ac6a81a22da39d2a79c973 SHA-256: db5132c76fd69ac844854bd6e4bdc63eb0c8cfead87b809287d1f76ce8ed7c39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.thaiboat.net/image/upload/File/vajateno.pdf In PDF document text
    • http://bostonmentors.com/userfiles/file/33126333927.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/5913395a0c353e2829a030fd24a7630b/51159605174.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607348d5607b0---65767113044.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/73227282634.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713640d7baa---45856076437.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61e895aa1e---16431454809.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/jukumif.pdfIn PDF document text
    • https://artenika.pl/fck/file/33819630193.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f4a53bdf1---31562478954.pdfIn PDF document text
    • https://baptistfriends.org/media/1890640412.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/468c2baae05cf6aa2bd86f73aa30b7ef/53963328678.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/74028691730.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0f0ce408e59c01b7ab3f6782cadf4194/77542376184.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/tixozi.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/3b86943963e8071b242e509cf10998da/74055198039.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/39297727741.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=learn+python+the+hard+waPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 4712 bytes
SHA-256: b36cdc177432da1a917d86a9b32a0329b9533d5abc4ede5bcec0d29bbc250016
font_01_sfnt_off0000ef2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 11248 bytes
SHA-256: 60caad11adf3ab2eb726a7ba950b1bd5d64c9b35f911b673a84902423b18e58a
font_02_sfnt_off000115b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f