Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d1c2436ccad29a…

MALICIOUS

PDF

87.3 KB Created: 2021-07-18 18:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d9dafbe0b1056227fbc287ffda69a7b4 SHA-1: 2df6f6c83e716539f5ee2014d4b13dc118df0ffa SHA-256: 70d1c2436ccad29a8a1d37af2a220e06fa886cd2bec2270d5eb68a0d16085fc1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and also by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload storage and other disposable hosting. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f94f758ee---biwoni.pdf In PDF document text
    • http://phuocthuan.vn/images/pic/file/pepofovixurimupozab.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd694a624---zutodekij.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/89031316571.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/wodidosaxuvimegarunakume.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c40e8ff08---nopol.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/dc170c4052a5d3db93bfc02a551576f3/15670922472.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/dvellh678r4b3urgeunm4pgqs7/17581963379.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/70018395384.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/03206cad241708c6277a90430f828764/virajew.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/33682086404.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9f0013b02---jitavuruxetajiwud.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/89877406518.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/8625034665.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/gopolutobaxaweful.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/92794232721.pdfIn PDF document text
    • http://oicenglish.com/imagexx/files/bosijesevogukinosew.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/54852064991.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/36bec79695499ca2639735801bc18b19/ferinamitigavusivulanus.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/72067343285.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf94ae99443---susuvawegolorin.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db2450fe8e---gixapiropum.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/efp9vknsm8617qc5d01divol91/xadeluliwas.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c9b6a81ecc98b24a0d7c626f37cdccd4/ditiravujodisiwixekeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=i+have+forwarded+the+emailPDF 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_off0000f1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 10452 bytes
SHA-256: 7c551370d72e67669cc04f146446be5187b699c9e54a6221d824f96464a1ac1a
font_01_sfnt_off0001098e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098E 17824 bytes
SHA-256: 92a44873a5744a04e0fdf88b4219b97632011759da7a3e08962cdad657aa4539
font_02_sfnt_off000137fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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