Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e98f312e64a6cd1…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 07:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 047b022394a21627510b811a34594b19 SHA-1: 9c9cdae0627e814f3abdbb6c716340cf3b648428 SHA-256: 9e98f312e64a6cd12c7c87fc3829ab4de6dc4d185fb6d0cb84ab790f5927e7e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/ce27da64df813715bd6979b7fb2b0b4c/zexanaxepunusijetofan.pdf In PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/790a110961a7f407e64b28cc4c90156c/34672992547.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/vipodojuwoxugig.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/ponasoteve.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607801685ac73---48907906483.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/88845880365.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/c7cu4r7tnbseq2iootgbqjsjer/36083715322.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098f39e15a61---57307425073.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/dbe42a5a2fb7bca706ad419b580fba90/53930855737.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d798d9100---3191781491.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/pudab.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/d225b15af10675ceece434c2bd808366/93148213581.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/2287f46d3afcef4556b4c2f6d548dc7c/27204651785.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/gigagatixi.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/beserubakasixukanegetufon.pdfIn PDF document text
    • http://boxethai38.com/upload/file/369730274.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/tepurawaragawupapiki.pdfIn PDF document text
    • http://gapp.fr/medias/files/35273411682.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/86552042979.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/db7e019df3869a011342122235366238/66104470893.pdfIn PDF document text
    • http://freeski.hu/freeski/file/sepuzalojelu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f664fda927e---pikoxoxozo.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/32090022545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=osmo+mobile+2+owners+manualPDF 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_off0000d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 10644 bytes
SHA-256: 73e2d168f40fe8e3054a3defa7d02fb4b304ffc6246d31d593352f4b72235305
font_02_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 19412 bytes
SHA-256: 5a5df3bdd1a37b73286da0db1449fc0d9955a3a55d36df7876dca51a9358f758

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