Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b234233267ef81d…

MALICIOUS

PDF

93.8 KB Created: 2021-07-17 11:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b76ec8e21121227f1835943ae75d6bac SHA-1: f4203a49ca81f276de3a14f8dc002267df4c84cc SHA-256: 4b234233267ef81dca3b07948de92bbb41457136dad27e012f136b21ddc74219
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads or disposable domains. The primary purpose appears to be to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://offerseir.com/basefile/offerseircom/files/68077080825.pdf In PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ieneevl9sitjn2tvduq49ao1j7/34600890331.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/99257209106.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210702141333.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a53b2b1026c---78126415728.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/92951d4284160ae0bb85c7e7783b568e/tefupete.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/95639476168.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xejil.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/53931803722.pdfIn PDF document text
    • http://rfamilylucas.com/clients/73238/File/30190461094.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/96a3bae83d05c1360041ab06e4e0bbd7/banaf.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/676164767.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///63363854950.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/e50aid4na97j7lvuliem5qepvp/nolapu.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/fizutujiruxivupexeluvatex.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/kugizirel.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/jedisofexebako.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/128a652fc2c58d6ab0c703b58aa359d5/90562545964.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/rusex.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/pisuwogesinajavakotop.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/4b66a93a9b0b364986a11b68a0b8efde/22440853963.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9ab7612b5---tepuxulagazula.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/rivolokujinazejik.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/kabelirunovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=author+comments+to+editor+examplePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 17224 bytes
SHA-256: e1dd2151995096b5bce39f89426e07467bca63e110d50827a22be9c105845e07
font_01_sfnt_off000121d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 16348 bytes
SHA-256: f2b04fa57bd472238a9abe18ca68f80992fbfe74bfa3f5f6e132e685f126a8fb
font_02_sfnt_off0001382f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15046 10960 bytes
SHA-256: 88c9de60184b6051bb4b462714a3b2ceaeb1e6bfe5fcaf87e989d57bc496349f

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