Malicious PDF — malware analysis report

Static analysis result for SHA-256 caec8014359ff337…

MALICIOUS

PDF

175.2 KB Created: 2021-06-28 20:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b25578da837866dd82f69eadaa51777f SHA-1: 7390dd981112eb755e578568a6a29c1fde9c3af1 SHA-256: caec8014359ff337517d26ae98ae097a59fe24e654719b31dfae116c508c4b6a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9474

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://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/301146d14231b72ed08e7342bb60c02f/kopugab.pdf In PDF document text
    • http://hoaisonland.vn/upload/files/nexurafonexiwog.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/wejiwosukoposobe.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/48343673360.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a125b6160---37325159421.pdfIn PDF document text
    • http://cichanski.com/Upload/file/zademevuwabibo.pdfIn PDF document text
    • https://aedwea.com/upload/foto/47364810692.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608791645bcca---tinuvij.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b590f44e296---sugetejuwelijuxe.pdfIn PDF document text
    • http://aven.su/userfiles/file/jozaradefopujolijawasa.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ba639ad690b---rizegu.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cf9faf4fc---69282379897.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/1194859662.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/suxibosenivuxajurelalik.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/86902276448.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a79fdaef6---padalikowux.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4d7de69c9---ninufome.pdfIn PDF document text
    • http://wirheiraten.de/images/file/pefiwobuwo.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa82aedc82---71082577214.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072f6d557783---92901877868.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/26r67qm8mk7jskf57ns1551043/bejolefugu.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/nexofubatiwegadav.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a5dd2c2cc---14466151910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=who+was+the+bumblebee+on+masked+singerPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22B11 11108 bytes
SHA-256: 5c2f8ee6a5d9209fefc7ed36779588a24e8b30f441a3ddca96ed684510bb595b
font_01_sfnt_off00024497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24497 18608 bytes
SHA-256: 08bceb22607cbc726c335994c0277fcc36832f9033d339a5241cea1432c5d91f
font_02_sfnt_off0002753c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2753C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00028d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28D49 2532 bytes
SHA-256: a4f99e539b230ffe339723dcca5c2426ab593f99ed291c21939b9df092dbdc21
font_04_sfnt_off0002982f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2982F 16216 bytes
SHA-256: 8c2e9d80d580d08964a5048de7b59c27befd741f1c379efd0abbd599686b3e88

Open this report in the interactive analyzer, or submit your own file for analysis.