Malicious PDF — malware analysis report

Static analysis result for SHA-256 505469c5bc603a31…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 21:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9bca4f894462349142818e3e73485dc2 SHA-1: e0d551de7001bb7190cdc4615193e184625f3c1b SHA-256: 505469c5bc603a31e4428f3d94d9229724c3f992157c5a148233ed8c1d148045
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting multiple URLs that likely lead to further malicious content or downloads, disguised as a call-to-action button. The use of compromised CMS upload storage and disposable hosting suggests an attempt to obscure the true origin and nature of the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lapakunited.com/contents//files/93245843370.pdf In PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/kujisefinu.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/62062203850.pdfIn PDF document text
    • https://jss-moms.si/upload/File/28032598455.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fffdba9bcb---45991300268.pdfIn PDF document text
    • https://senhewood.com/d/files/losimumumetozododexubab.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/48d76f7b4bb366742b559a6c86f76648/52762433163.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/nuseze.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/noxopogegijegapod.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/853180314.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/57570682946.pdfIn PDF document text
    • http://hosteleriayvending.com//ckfinder/userfiles/files/33271140919.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/24024415179.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/42406269394.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/78817894652.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/50750620195.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bf60f008d---64942874219.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f61f95c0f0---gufazem.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/46461471113.pdfIn PDF document text
    • http://pasaru.com/upload/files/vebaxifurigoratexujakut.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/dimamemetitududatefiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=benjamin+franklin+schedule+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 18344 bytes
SHA-256: 6f954153067a0f2ea24475d470a0275f1aa69aca65971a598c12839c6abe4608
font_01_sfnt_off000106e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF8 11040 bytes
SHA-256: 7f67d2d3dd4cc28bc8278b6108f460b3efb92a1d5815118b66d5e17658de5074

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