Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f981f1d2aebc96d…

MALICIOUS

PDF

78.5 KB Created: 2021-09-10 15:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3cb48edfb6031db8ca57cc1a3e01e353 SHA-1: 25ec458698bbf3919b2d70509f8cc1a29f1b8dc9 SHA-256: 3f981f1d2aebc96d3aa08c3f95cbc4ba5350b456dc3ef91b8bb8ae14c432e7b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://motivationandmomentum.net/ci/userfiles/files/81081768788.pdf In PDF document text
    • https://stephankeppel.com/userfiles/file/gelune.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/tolovunovujiruvoxupufu.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/28485943000.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bcdc22512---towekirefup.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/tesagi.pdfIn PDF document text
    • http://melvin.cz/data/17422486184.pdfIn PDF document text
    • http://usateatop.com/_upload/files/babosaluk.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/3056497532.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fd2971564---gosobusarejoko.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec38a17ffa---62471266546.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/rijururozimubilidubu.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/mekilopevat.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/tujuzevilimotazasikumubi.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/76771783856.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/biwaxedijufetinefo.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/rovuguvuvaxevogabekupujax.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/jumawitopefuwutejiz.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/dh38kaoh8euekfsjqecfnrit7b/7086408337.pdfIn PDF document text
    • http://honda-vo.com/upload/file/18124780731.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390a9ac7652---gejil.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/jebizilugifotoneniwu.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/53375669948.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/tukemabazijisusumokerime.pdfIn PDF document text
    • http://kdekdyjak.cz/data/96694558702.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/fdff0dae948521d5e4125000659e49d6/wujevaviziginusuwavafoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=this+is+spinal+tap+putlockerPDF 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_off0000c9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B0 19492 bytes
SHA-256: 523fb914d37c0a35b1e60bc103395012043225ad66f855fd2163b166d41e71e2
font_01_sfnt_off0000fc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC36 10624 bytes
SHA-256: 06d0ec075dddd5b08baf0554545710e0e2aae77abaf56ef91dc88d02207040a7
font_02_sfnt_off00011481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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