Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f685bfe82ba72b9…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 02:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c0c7255609b29c8f705e61ace614d7be SHA-1: ed60404ac84ac693b93b8ad379144129a39f34fc SHA-256: 8f685bfe82ba72b901c550a1b869fab2e42ddc5557871b0ec0d3242323f9ce1a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to numerous other PDF files hosted on various websites, some of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://aathichudi.org/userfiles/file/70612650114.pdf In PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/e9e778d045b504f10749738e81a55304/44651656510.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f740d87067e4505948975ef469b676d3/59169905606.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609c45b966168---budovonapabiwoponimojozod.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/zimaf.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210725165405.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16108ab3871617---62765585373.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/xoputetemevux.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/ac18106744a6a0d3019ab13002add550/33054892936.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16126d1b20c45f---97985865293.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/61747129650.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a0dad404---buvikugezosupejugorerum.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/51173142696.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f55fae349b---32313439373.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/74389171899.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/tixotenevasomasobojexaved.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/lfe60vec4om7vfidr1eudc7uaj/ralazurigetomidazuwidomiw.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e535e4bc54---95398489148.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/33773108158.pdfIn PDF document text
    • http://bluebossa.pl/files/file/15944254507.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/1ppo9tq1ujqnafvehd1kov62e6/73407947209.pdfIn PDF document text
    • http://vo23.ru/upload/file/16088403314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=vnc+viewer+for+windows+10+64+bit+free+downloadPDF 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_off0000dd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52D 11152 bytes
SHA-256: b816d6d4d25f4f3d2c074e5f263511d5adf65ea2f78043a38122fe0d11aaf4fc
font_02_sfnt_off00010f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F80 17944 bytes
SHA-256: 5597513c9e8eb039bec81ae44c7921cbf250eed5c4250bcabf020b585aee9e7f

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