Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa8ed006dfa35d1…

MALICIOUS

PDF

86.3 KB Created: 2021-09-18 02:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a2d7415ffca2872c0aef1f5210659116 SHA-1: 9bb52dc681a013daef64a7482f619876000b244f SHA-256: 7aa8ed006dfa35d1d0e480a96cfd372864a6c7e6a583c908dcd3d6e2ffaf42ab
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary purpose is to trick users into revealing sensitive recovery information. The presence of numerous links to potentially compromised CMS upload storage and disposable hosting, as well as a high ML classifier score, further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it acts as a phishing lure, likely intended to lead users to credential harvesting pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://kubkao-kubpla.com/userfiles/files/32422469729.pdf In PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/pofaz.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/qj9vjno2idhq6ncqi7o1m89aj8/betubezaboxok.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/99983233648.pdfIn PDF document text
    • http://bubb.cn/up_file/file/994255090.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecd2c9080a---mexaxejiziwi.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/wugedisonusijetuxobasa.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/6894966924.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/timonedewuma.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109120843289459.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/fojoritebanolajelanepuvap.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161442d5fc537b---56564447658.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/9581080217.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/78502627304.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/72670705715.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/xoxowami.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/resimumomimutoxiveg.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613682d7dbd7c---wafemamokoxona.pdfIn PDF document text
    • http://cx-gl.hu/images/files/31029378139.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e55c523580---51756736129.pdfIn PDF document text
    • http://methese.com/upload/files/setivotofaraloxupenuxuz.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/021336054063.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/fipigowaxifo.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/55786723826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pi+4+android+tvPDF 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_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 19752 bytes
SHA-256: 096bdd7595aac464978e897117f13a5437546453540326861c6438392f1d19ca
font_01_sfnt_off00011dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC2 10040 bytes
SHA-256: fe9d8f59b9f326b319991ee54a79e0ac8970f90394ec62dd25557ba11e7ac98e
font_02_sfnt_off00013432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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