Malicious PDF — malware analysis report

Static analysis result for SHA-256 459486762e0f8837…

MALICIOUS

PDF

89.8 KB Created: 2021-09-17 23:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f7ae326e68d722f50489e74445fe5c6 SHA-1: 49cecc0f747105307f59f036e036d5f82ae33c4b SHA-256: 459486762e0f8837a0db7ac8b0d798dcd338ff4f0f8eeb4c361e08242e47271c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories. This suggests the document's primary purpose is to redirect users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://gibidesign.com/fckfiles/file/zerep.pdf In PDF document text
    • https://weeb.nu/userfiles/file/finig.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/perapuzavufu.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161404f37f2034---43043057569.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/o9c4fk6d5sf2vg1eggpktrhbh3/nogiwevujitixedese.pdfIn PDF document text
    • https://codecs.ro/images/file/falenijolimudusot.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/57183473351.pdfIn PDF document text
    • http://prosquash.by/data/62985720572.pdfIn PDF document text
    • http://thaide.org/userfiles/file/81931411500.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16144a35ee761f---51945936430.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/5616947deee169fbf0bbf196753554b9/48124167801.pdfIn PDF document text
    • http://harlit.com/upfiles/file/veduzuliti.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/ninupatulukumide.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/punibizatadugirepusoja.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141f1e28ac32---32156215783.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/45c66ee74f159cc00640e3c47754c063/76668624584.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/deu6jiniv08ltr9n5hi3fsbtsf/zapupokudu.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/naxuvuvizanawufaxebozi.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/sexisonimagimot.pdfIn PDF document text
    • https://shiksha24.com/userfiles/files/juvanopobiz.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613166f8ac3b6---vokapamonabo.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/warutipetunoxufidikot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=one+piece+film+z+full+movie+eng+subPDF 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_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 10856 bytes
SHA-256: ccb37e49012e953f54f165485c7fff946a52a4d4abca102a4612192cb621a5b1
font_01_sfnt_off00010856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10856 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 21844 bytes
SHA-256: f651fbe710524460bcd199a9d86ade12d986fd3444e5fdcb1f73bcca3be42268

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