Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd15a468f52d9d2a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 12:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 623446475c881ec907b8e1801a04497e SHA-1: bb26c9dcf3c307949403e5157f8733a43ea835b8 SHA-256: fd15a468f52d9d2a59d17e6db712371695ca3460948a18ab7c4406e7557955a9
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be user interaction with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://4bx.pl/public/file/wagivube.pdf In PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161121c59d61a8---80425769114.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/jiduwor.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/1338350546.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8805ba2f12---vopepelarepipazubujuvato.pdfIn PDF document text
    • https://landbar.com/upload/files/57823226814.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/57646746552.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b4dde9ecc---69627120173.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/suzubewadebeparisusoxuw.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/pujukalulonu.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/pawoj.pdfIn PDF document text
    • http://prosquash.by/data/bejazaduwunabedak.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160968d4080580---tebovebiwaxomiw.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/78240726565.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/9vg146ignaidtdh37kvuimikej/82300975077.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/togiwisunikabigakabuxuxev.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/c9apil55vr6qm53qnv7g5rgigr/819874773.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/52abc297cb040fe10b9db7b602de843f/kivitaze.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/kulobopaveko.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/50480637301.pdfIn PDF document text
    • https://finliz.lt/i/File/74285291266.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210613_E75099D6BEE9C42F.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/zerire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=malayalam+film+songs+lyrics+pdfPDF 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_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 17876 bytes
SHA-256: fd991081cf0c8c398a77c208f71e394e3ec629c00ebbcc0df6b09dc7cb7406d6
font_02_sfnt_off0001216f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216F 10840 bytes
SHA-256: 7bd930575736930eb697989ab8e6af5c23cab293d8c335d125c22d72e57468d4

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