Malicious PDF — malware analysis report

Static analysis result for SHA-256 383d3e9b99dde0c8…

MALICIOUS

PDF

88.1 KB Created: 2021-09-16 03:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0df438061c5522bb046c67d05138d63 SHA-1: 522ffcca6bdc3c0403a09b1a17609363238b7103 SHA-256: 383d3e9b99dde0c8354b4b5774a120703d3be09273bd4b21f3ab85437343d857
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external websites, some hosted on compromised CMS platforms. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kerrya.com/ckfinder/userfiles/files/34103892661.pdf In PDF document text
    • http://salonorganica.ru/upload/files/farajejixofigoxofajexevet.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbe17d8b56---38570674609.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/16594730351.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/zapefonukupemululub.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/pilitamanowasavokawos.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/fozabazifijizam.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/80064365928.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a23dd73b18cf4931fc1865a90b1decef/sotupujuxuf.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/2648840794.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/dowodaxavamosisat.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/virivovonejizoxe.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/f04da75c9f99f76609d847cef8488495/79261694350.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/zekejebakarikadu.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/vevusuwanok.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/uqk2oq5ds6u4ng7cgolha8uc6j/vuvufe.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135756b2e9bc---nazasinafo.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/90008276458.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/jopuranevana.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/71834325016.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/pusevijilad.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/15915279915.pdfIn PDF document text
    • http://skncn.com/u/files/pulefixuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=games+apk+mod+offlinePDF 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_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 17452 bytes
SHA-256: 7118bfbdb776d4bc9ba3ccda2a55255060e20a1a563110608c89ba70159f88c2
font_01_sfnt_off00012324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3B 10592 bytes
SHA-256: 49c864f6e1e4bc12b49bc474b03f458d45445a38bf61b675d631f8da401da6a7

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