Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f0b7bdea367f903…

MALICIOUS

PDF

90.0 KB Created: 2021-07-14 02:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 940d0695cca06d23ca4c78417317dd26 SHA-1: 66e74dd17166db9f82633287bfb64126c32ea182 SHA-256: 2f0b7bdea367f9033d020ce68e29886da1620fd5114d7f25579f3948122d85cc
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or exploits, hence the classification as a potential exploitation vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078b3f4512fb---pajefijarabizovanaje.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dea3a2ed1---83676300334.pdfIn PDF document text
    • http://mamam.by/upload/File/file/37553730025.pdfIn PDF document text
    • https://ebooksweb.net/files/file/morazalerik.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb8e096b4a---34577026372.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/0a9d2d44007792e6ee99c657ccdccab5/12238468020.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/ximavote.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768ea29ee08---xinabuziwidulinate.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/bawofudixexubepef.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/78135337557.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/34362923107.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/gezaka.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/sejotofakojipu.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/52924216356.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-21/20210521072126155297.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ac73c0430---najotivam.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdcb52752e---78568745747.pdfIn PDF document text
    • https://2acontractor.it/images/file/wuvubijunaniwadolodowoda.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/67335293817.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/73c76db7ad486d7de2dafcfe7b1ea473/nafajerunuviwela.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767ab5b0a64---buxarafamubonasowuruk.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/sidogukeporijuzozoxejuvap.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/1d8b32eace755a58629049af0f230868/puwasuzoxexadosaxijib.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/lh7u6qlkkm0l6u30khdf7n4eun/36698590951.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/xofezevikujod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+unlock+the+blue+falcon+in+mario+kart+wiiPDF 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_off0000fd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 17244 bytes
SHA-256: 5cce39a70982e2c4fb6ac8cf27dcb15e8734c658a07ddd7af3a7032a24e75417
font_01_sfnt_off0001294b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14162 10840 bytes
SHA-256: 3132ea81478ff00a807d26d25e4c88cbc65f0f7d7b24201a75561c4cb791d4b5

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