Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6045a88ab7715f…

MALICIOUS

PDF

77.7 KB Created: 2021-09-11 08:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1dd3600ec490bba28317e0619e723ed SHA-1: e11c4d05154071ba68cfb90f5222081b57791dc8 SHA-256: 4a6045a88ab7715f970c10db1314da624632c9a676d86eced98d2e18c32d9401
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. The presence of numerous links on disposable or compromised hosting suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://fernandopelosini.it/userfiles/files/muludazez.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332bd58b5f2---popoviweloferus.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/32513105192.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/kezosafemibomoge.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613be15f2c523---kakas.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132819decd38---75615978658.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130354fab891---dimifofamufodipunolorub.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/zekejebakarikadu.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/16406838676.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/gimagefamiku.pdfIn PDF document text
    • http://corkpotters.com/images/27938875606.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/jawakapixuzek.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/dekedoz.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/q5v210v0jk834rdq8t425n2ls1/xateveropetoxi.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/60025363242.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/30369621130.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab152a5bb0---bavusebugitijula.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/60005408577.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/deaecd1a335dc363d0670c69e201ce1f/nolenegig.pdfIn PDF document text
    • http://www.77ice.com/upload/files/59439372908.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613758800cbff---1573166164.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/lemiporizir.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/84171313273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tencent+gaming+apkPDF 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_off0000cc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4A 10336 bytes
SHA-256: a24cf77f450a7115166b61d3c84541b9d37ecfb4bac16bc4fcc7ebbb9f160626
font_01_sfnt_off0000e3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 17664 bytes
SHA-256: 70890fa5a8200c59d8cb59fc3629223d8f50f8a893dc038c0100da509c0fd198

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