Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d45d5299aa5ad1a…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 20:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4bbf9f8344af6ba6110bb6f0b26a0b94 SHA-1: aeba5e00aa4499bf0df5c59ec4de3041569ee237 SHA-256: 6d45d5299aa5ad1ae13199e4bcae4a2c521bcdb09a0d0b69e3a43dc65d2c07ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://cructi.ru/uplcv?utm_term=subject+verb+agreement+paragraph+worksheets PDF link annotation
    • https://childconcern.in/trila/userfiles/file/69717697718.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/konebowapebira.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/besilixos.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/tafupolirufele.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a025c6f23cf---fojubos.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/33896910075.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/46778120904.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/97950834539.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a780af7dd5cec88c88e460b211f3c951/busoniruguwuti.pdfIn PDF document text
    • https://tch.lu/files/files/topadebexebodazalikokir.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161266f293cdfb---98605818855.pdfIn PDF document text
    • http://rayer.cn/d/files/59947230626.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/supixedevad.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/960be3c1d9bbac7a91021bb981b35345/23263229368.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/xolezatipinabobera.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/weboseveruposesodovovolus.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/92319b6d84bb0e9aeea2dbcfefa6eed1/zelubipilenujub.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/pulejefigigifudedusutu.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ge3adld52m8ese1ne3cvmgmot6/wetatamofivasos.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/64738775583.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebb69b6f43---zuvonagoxu.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/53658781029.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/kepowetugopija.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_off0000e173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE173 11372 bytes
SHA-256: a076ba62fd8da4b0640e6bd05bd97a099bcec1860805e81a2e5bb5930465d078
font_01_sfnt_off0000fbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF4 18624 bytes
SHA-256: 1612014303f6b844835daf52efcdb5fa5ef554c1dad486b4fb88cab9b4ed84c2
font_02_sfnt_off00012c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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