Malicious PDF — malware analysis report

Static analysis result for SHA-256 35585b5a37452494…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 10:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d04ffeb6dcf87ce0871ca4baae9fa394 SHA-1: 0017e8ba2139e3cfa35de737db3ff3f4967f1bf5 SHA-256: 35585b5a37452494fe73a01749dc305231e71b25b403dbf68c60889390990ac1
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which appear to be part of a link farm hosted on disposable domains or compromised WordPress sites. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary intent is to solicit sensitive recovery information from the user. While no scripts were explicitly extracted, the presence of external links and the nature of the lure suggest a phishing or social engineering attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://queure.ru/uplcv?utm_term=can+i+cast+from+my+phone+to+ps4 PDF link annotation
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/gulalunerumivamujutomunof.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614083493ba3a---ruredamegogeropijun.pdfIn PDF document text
    • http://7profi.net/userfiles/file/durabamoxadafawilole.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/65545972609.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/fixalutipunexevagigafun.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/jejenaro.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/belowolati.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/60217939307.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/20974897294.pdfIn PDF document text
    • http://fgosvo.ru/files/files/sidusemutupe.pdfIn PDF document text
    • https://12waktu.com/contents/files/51799709913.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/pobar.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/91376735846.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/xisuridusumeborilef.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/rokizu.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/43834077443.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614927df27c3a---96415465470.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/mopegubawizagu.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16150d624d1e7b---33023978565.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/5923091845cff4bc07e60a2b9ef32e08/bowotugojabenuturuki.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/sadajanitawarexevorozu.pdfIn PDF document text
    • http://acril.ru/ufiles/files/repakirutejipusuxebawojeg.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/21471592189.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/85179528789.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/81791565414.pdfIn PDF document text
    • 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_off0000b013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB013 14848 bytes
SHA-256: c1ce05dfb4bf2ba3eb5eb50d4920170874ddefc97fa390703a403e802eac76a9
font_01_sfnt_off0000d53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53F 10924 bytes
SHA-256: 3dacdc541ba496bb9176b1c57a1735018b27cbcff3579fc8c82ce1db9da156a5
font_02_sfnt_off0000ee80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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