Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a43dd1c176c90b6…

MALICIOUS

PDF

82.3 KB Created: 2021-08-14 22:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9fb421be78fd270bb10501c774a1174 SHA-1: c872878bf192c923199e58d1f59984f17e66725d SHA-256: 7a43dd1c176c90b60e2b23d47d18e84294595dbbfcf84f27b4da8610e809ed2d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://geostudio.eu/userfiles/files/78837039917.pdf In PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5944ee356---soluxotebego.pdfIn PDF document text
    • http://belst.by/upload/file/17404998013.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/164b843c7e8c343cc749c435458e4f53/43426458043.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/tuupjgufsugjknmmleom8ffd5b/zedada.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/16353216213.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/23210820011.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/73728401430.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160734554ce8cf---pemikaxebidofo.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/70093725591.pdfIn PDF document text
    • http://allasclub.com/campannas/file/87282825208.pdfIn PDF document text
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/regabedezufanutiliripev.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/852d92181a2f5b90937a3f958b7fecb5/64306849357.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/bokeraxulujonilok.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/resijorupuwaj.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e0981dbe3---lofilawetiripogudin.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/renasuzotozafigeropes.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/eaa66131d7508f293e3212bf3dc666e9/gapaw.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e86ae2f25b---dexizajomufabaxoja.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/138175480.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/52496575873.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/e4d38293a4ec7e836e30f1f88cf8008d/denimupadesilafidirate.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/buwulufinisemokuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=roblox+mod+menu+infinite+robuxPDF 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_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 16968 bytes
SHA-256: 57a0ecf546847cdecc7cc5c36444df67f956e14ff56eef92cb6deee03d906f81
font_01_sfnt_off00010a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 10572 bytes
SHA-256: 035f81a0fa0d9d648ba4defcc2a5158aaaa4a2ba64ee2b1b89ee3a8122c17954
font_02_sfnt_off0001224f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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